Belgium then on to France (2 weeks)

I really don't think there is any point in flying into Belgium and travelling to Paris the next day. You won't have any time for sightseeing with all the stress of arriving the first day and departing the second. And you'll probably have a wider choice of transatlantic flights arriving at Paris than Brussels.

Your proposed route probably is best done by train, and Paris - Dijon - Avignon - Nice is broadly-speaking on the same railway line. For all your journeys you will probably be able to get MUCH cheaper rail fares if you book online around ninety days in advance, either on the official French rail site or on Capitaine Train, which some find easier to use from the USA. However, cheap advance fares like this are only available on specific trains, if you miss them you will have to buy a new ticket at full price.

Unless you have very specific things that you want to see in both cities, I don't think it's worth visiting both Dijon and Avignon.

The trains will work admirably for everything on this urban itinerary. But do note (for future trips) that some of the best stuff is out in the countryside, especially in June.

For a short stop in Burgundy, I'd prefer Beaune to Dijon. If you like you can rent bicycles there and see a little of that countryside. But I also agree with Phillip that you might have a better trip if you don't try to cram quite so much in, and you might save Burgundy for another time. The TGV to Avignon is less than 3 hours.

To my eye, Paris and Provence are the a real highlights of this itinerary. I would spend as much time there as you can manage. Arles a better base than Avignon. Lots of great stuff on the rail line, but to see sights such as Les Baux and the Pont du Gard you will need to plan carefully. There are buses in season.

I don't mean that your original plan is logistically infeasible, just that you might have a better trip without Burgundy this time. But have a blast whatever you do.

You don't say, but this seems like your first trip to Europe. Have you read some of Rick's (host for this website) general comments about European travel? He's big on moving every night, alas, but you have laid out a frantic schedule of packing, getting to the train station, and figuring out the layout of a new town almost every day. Start here: http://www.ricksteves.com/travel-tips

Since couples often are better acquainted with each other today than long ago, there's no need to schedule a frantic round of activities to keep busy. But you don't seem to have a specific list of things that you really want to do. Paris is a fantastically romantic place that can't, remotely, be seen in three days (two, with your Versailles outing.) Sitting together for hours on the train isn't nearly as nice as sitting on a bench in the Luxembourg Gardens, or at a cafe in Paris. You seem to have picked Dijon out of the air-how did you select that idea?

You don't have your home city in your profile. If we knew, for example, that you were from San Diego, we might ask why spend three days at a French beach? But do you have other interests in the Riviera, like auto racing, gambling, James Bond, 20th Century painting and sculpture? Have you checked whether Nice is a good (routing and price) place to fly home from?

The first time we went to Europe after getting married was a week in London followed by a week in Paris. The next year we spent two weeks in Florence, Rome, and Venice. I recommend you create a list of cities with nearby excursions, and go to maximum of three. Some ideas: Paris-Strasbourg-Basel, Paris-Bruges-Amsterdam, Paris-Brussles-Cologne, Paris-Tours-Avignon. If you'll have light luggage, the bargain-airlines actually open up a lot more options, but you have to do detailed research and buy far enough in advance.

1. There are as many air connections from Brussels than from Paris as it is the capital of the EU. The airport in Brussels is nicer and there is just one, in Paris there are three. Just look at the best price, either to Brussels or Paris and decide for one or the other accordingly. Check Brussels airlines and see whether they offer interesting routes for you. To travel within Europe by air, check also: -from Belgium: Ryanair and Vueling Ryanair flies either from Brussels National airport in Zaventem (Brussels) or from Charleroi (35 miles from Brussels). There are bus connections from the Midi Station to Charleroi airport (now called Brussels Charleroi). Check flibco.com. only payment by credit card. In France, a very intersting airline flying within France and to Spain and Italy is Volotea.

If you decide to go to Dijon, it would be a pity not to rent a car and do the wine road (route du vin). Dijon is a very nice city but it might be very cold in the winter. It is the capital of Burgondy, so famous for its wine. Try to visit some cellars "caves" and taste wine. Do not miss Beaune with its"hospices de Beaune", it's fabulous.
Burgondy is also famous for Romanic art and the Autun cathedral is one famous example. You could certainly spend 5-6 days in Burgondy if you do all this. In Paris, you would need three full days to visit the French capital and another day if you decide to visit Versailles. The castle and the park are very big. The other days would be spent in Southern France. Do go to Hyeres, Aix en Provence, Avignon, Aigues Mortes, les Baux de Provence.
If you arrive in Brussels, take a tour of the city, go and see the Grand Place and to the rue des Bouchers to eat a typical steak with French fries or mussles and fries. Do go to Bruges another time when you have more time.

1. There are as many air connections from Brussels than from Paris as it is the capital of the EU. The airport in Brussels is nicer and there is just one, in Paris there are three. Just look at the best price, either to Brussels or Paris and decide for one or the other accordingly. Check Brussels airlines and see whether they offer interesting routes for you. To travel within Europe by air, check also: -from Belgium: Ryanair and Vueling Ryanair flies either from Brussels National airport in Zaventem (Brussels) or from Charleroi (35 miles from Brussels). There are bus connections from the Midi Station to Charleroi airport (now called Brussels Charleroi). Check flibco.com. only payment by credit card. In France, a very intersting airline flying within France and to Spain and Italy is Volotea.

If you decide to go to Dijon, it would be a pity not to rent a car and do the wine road (route du vin). Dijon is a very nice city but it might be very cold in the winter. It is the capital of Burgondy, so famous for its wine. Try to visit some cellars "caves" and taste wine. Do not miss Beaune with its"hospices de Beaune", it's fabulous.
Burgondy is also famous for Romanic art and the Autun cathedral is one famous example. You could certainly spend 5-6 days in Burgondy if you do all this. In Paris, you would need three full days to visit the French capital and another day if you decide to visit Versailles. The castle and the park are very big. The other days would be spent in Southern France. Do go to Hyeres, Aix en Provence, Avignon, Aigues Mortes, les Baux de Provence.
If you arrive in Brussels, take a tour of the city, go and see the Grand Place and to the rue des Bouchers to eat a typical steak with French fries or mussles and fries. Do go to Bruges another time when you have more time.

Avignon if you are there in July, do not miss the festival.
Arles is smaller and wwonderful and so much to see.