Suggestions for day trips from Aix-En-Provence

We did Les Baux in 2015 - we spent about 2 1/2 hrs there - but we were there in Oct when there were no demonstrations going on, and we didn't know about the Carrieres de Lumieres. (We also spent about 45 min popping into the shops and having a quick bite to eat). So depending on how much you want to see and do, you could spend anywhere from 2-4 hrs I'd say. If you are interested in Roman ruins, on the way to Les Baux is Glanum - we spent somewhere between 45-60 min there (they featured in a book my husband read, so he was keen to visit).

We spent a half day in Arles as well, so again - depending on your interest, you could probably do 2 of those 3 places in one day (haven't been to St Remy).

Roussillon and Gordes are very close together. We spent a few hours in Rousillon (part of that having lunch, the rest just wandering). It was very pretty. Didn't do Gordes or Sorgue. We're going back in July, and will probably visit these spots -Gordes for sure, to see the Bories and Abbaye Senanque. Again, you could prob do 2/3...depending on how early you get started, and of course we'll have long daylight hours in July.

Also keep in mind, this is prime lavender tourism time - I wouldn't be surprised to have issues with slow moving traffic, or having issues finding parking.

If you weren't already going to Nice, I would suggest a short trip down to Marseilles for the Mediterranean. In fact, just going there to see the old port in the summer, and taking the boat from there across to Château d'If (made famous by Alexandre Dumas in The Count of Monte Cristo as the prison where Edmond Dantes was imprisoned), could be worth a look.

The boat costs €10.80 each for a round trip ticket, and entrance to the fort is six Euros for adults and 4.50 for "reduced price" (don't know what their cut-off for children's rate is). If you're an EU passport holder, the kids enter for free.

My wife and I went to the camargue in February and really enjoyed the scenery. We stopped at the Parc Ornothologique and saw hundreds if not thousands of pink flamingos. Saintes Marie de la mer is a neat little coastal town. This area is also famous for its white horses. You can even ride the horses if that's of interest. Here is a link for more info if interested.
https://about-france.com/tourism/camargue.htm

On our recent visit to that area. We were only there for 3 nights and 2 whole days, and definitely wished we had more time. But those two day trips sound reasonable.

On one of our days we got a late start, went to Cassis, had a long leisurely lunch on the harbor, and just poked around the town, with no real agenda. Definitely worth a day. We hit a winery on the way out, and could have squeezed more out of this day, but the weather wasn't ideal, so getting back to our friends' house and visiting over wine and cheese was high on our list of priorities.

On the other day, we went to St. Remy in the morning and really enjoyed the market there and strolling through the town. We then went to Les Baux, and absolutely loved it! In addition to seeing the town with hardly any other tourists there (again, not ideal weather, so turnout was probably suppressed a bit), the highlight there for us was the Carrières de Lumières, which you'll simply need to see to believe. We finished with a quick stop in Aix on the way back to our home base, to pick up some goodies from the Pâtisserie Béchard. Could have spent more time there, but there's always next time...