what to so in Avignon/St Remy for 4 days?

I would definitely recommend that you rent a car. If you plan to rely on public transportation you would be better off staying in Arles, Avignon or Aix-en-Provence. I don't believe the public transportation is as good from St. Remy.

When looking for a place for my upcoming trip, which includes 3 nights in Provence, I looked at booking.com and airbnb.com. I also looked at vrbo.com and homeaway.com at apartments. I ended up renting an apartment in St. Remy through Airbnb. It is very reasonably priced. If you would like information about it let me know.

Things I especially liked in Provence:

Roman antiquities in Arles, Orange, St. Remy, and the Pont du Gard. (You can swim there too.)

Exploring the Luberon and the Sorge valley.

Visiting the Camargue and Sts Maries.

Market day in Arles and a local festival n St. Remy.

The other stuff (e.g. Avignon, Les Baux) was good too.

With only 4 days I would definitely spring for a car, you'll see much more.

With a car I'd go for a small town, though it can work in Arles.

We also really enjoyed Nimes in that area. It has the arena, the Maison Carree, the temple of Diana (on the grounds of the large garden). You can also rent canoes to float down the river under the Pont du Gard.

If you want to stay in St. Remy, you should rent a car. If you don't want to rent a car while in that area, you should stay in Arles or Avignon instead, as they have much better bus and train service.

I didn't have a car, and my favorite town of the ones I saw was Nimes. The Roman Theater in Orange is also amazing, with its intact theatrical wall, but the town itself was not otherwise worthwhile. There's lots to see in Avignon and (especially) Arles, too.

For lots more information, including the logistics of connections, you should get the book Rick Steves Provence And The French Riviera. His general France book has MUCH less information on this region.

My family stayed in St Remy the first week in May and had 3 1/2 days. Here is what we saw. Things we especially liked are starred with a * We're pretty energetic and my young adult daughters tend to move through sights more quickly than I would like to, but this gives you some idea what can be done in day trips from St Remy.

Day 1: half a day due to flying into Marseilles and a lunchtime nap. We attended a *course camarguaise in Cabannes about 30 minutes away, which is a 'bull game' in which participants try to snatch a ribbon from between a bull's horn. Les Antiques and Glanum just outside St Remy.

Day 2: Walked around Seguret and did a little hike, Domain Du Mourchon vinyard wine tasting and tour, Vaison-le-Romaine.
Day 3: *Eygalieres market Friday am. Arles sights: *great antiquities museum, *cryptoportiques, amphitheater, theater, St Trophime church. *Pont Du Gard.

Day 4: *Château des Baux 'castle', *Les Carrières des Lumières in les Baux, walked through Gordes, Senanque Abbey vespers at 18:00 in particular for the Gregorian chant during the service.

BTW we visited the les Baux Chateau on a Saturday because it was shoulder season and some of their demos were only done on weekends; in summer I can visualize that it would be quite crowded and I think the demos also occur on weekdays. We particularly liked the trebuchet demos and firing a crossbow.

We were always back in St Remy or nearby for dinner because the GPS gave us some fits and we didn't want to have to navigate for any long distance after dark. There are a lot of great dinner options there.

The street market in St. Remy is my favorite of the many I've been to in Provence. It happens on Wednesday mornings, so hopefully you can catch it before you head out of town on July 2.

We were in St. Remy for 5 nights which gave us 4 full days. To see the area a car is best as you can spend the time you want in each town and not have to wait for transportation connections. From St. Remy we visited the Roman ruins of Glanum on our way to Les Baux. When we visited Orange we drove on to the Gorges de l'Ardeche for some views of the gorge. We visited the Cote du Rhone towns of Gigondas, Seguret, and Vaison la Romaine, which was really too much for one day. We could have spent more time at Vaison la Romaine. We also visited the Luberon town of Fontaine de Vaucluse, which is the source of the river Sorgue and a beautiful town to visit and eat by the river, and we also visited Gordes late in the afternoon. This itinerary made for a full 4 days for those of us who like to take our time in each location. You can read about these locations in RS and also search on-line to see pictures and decide if you would like to visit any of them. Needless to say, we enjoyed them all!