South of France sites to see

I also suggest Uzes and Arles. You didn't indicate whether you will have a car; Uzes and Arles worked fine with public transport for me but would offer more options with a car. If you haven't been to Pont du Gard, that could be a good day trip from a number of places you or the other Jane mentioned. If you have any interest in ceramics, Saint Quentin La Poterie is a a lovely charming village to walk around and has a small ceramics museum plus over 20 ceramic artists' studios/shops to wonder around and visit. It is about 10 minutes north of Uzes by car or bus. Although Arles is a small city, the old town center was very quiet, at least in October.

The roman aqueduct "Pont du Gard"
Monaco
St.Paul de Vence

If you mean more narrowly Western Provence, you might try the northwestern section (spilling over to neighboring regions), with Avignon, Pont du Gard, Uzes and then further north if you like wine and Roman ruins to the Southern Rhone (Orange, Vaison la Romain, Chateauneuf du Pape). Or if you like water you could head to Cassis or around the Gorge du Verdon (Moustiers Ste. Marie). There is Cassis as was mentioned.

But of course the South of France is much bigger than Western Provence. You could go deep into Occitanie (Carcassonne, Narbonne, Toulouse), into southeast/PACA (Cote d'Azur, Var) and even the southwest (Nouvelle-Aquitaine/Bordeaux or Biarritz/Basque Region)

I'm curious what your interests are.
Scenery?
Museums? If so -- what type?
Quaint towns?
Cities?
Beaches?
Hiking?
Operation Dragoon?
Restaurants?
Wineries?

It's hard to make recommendations that matter without information on what you find interesting.

I think you will love Aix en Provence! It's a good-size university town with a very pretty Old Town: think lovely squares, fountains, narrow lanes, markets, and lots of interesting shops, cafes, and restaurants. Our oldest daughter lived in Aix for a couple years, and we absolutely enjoyed staying with her in Aix. Cezanne's studio is there; there are several interesting churches and a great art museum. Aix is made for wandering and getting lost!

I always recommend a visit to Eygalieres, a small village not too far from St. Remy. This is not a touristy village; you most likely won't hear any English spoken. Most tourists will be from France or perhaps some nearby European countries. Eygalieres has a wonderful market on Fridays, and only on Fridays the restaurants serve a delicious white fish dinner. You can walk uphill to see the ruins of a church and castle with great views from the hilltop.

I was in South of France the last week of May 2025, starting in Nice and ending up at a Springsteen concert in Marseilles. The weather was too hot for me to comfortably sleep without AC, so I hope you have booked places with AC. I was glad I did, even though one of them was not functioning.

Day 1-2: Arrived in Nice in the morning: easy walking town, simple train from the airport, nice little trolleys in the city. Enjoyed the waterfront promenade and the coherent "resort grandeur" of the buildings, the hot dry weather, the small but lovely (touristy but still pretty) old town. Nice views from the park overlooking the waterfront. Took train for Eze. If you can, walk UP from the train b/c steep and irregular slippery rocks, down would be a disaster. We took a rideshare back and that was perfect. Get started as early as you can b/c the narrow walled town gets extremely crowded with tourists from buses. It was a gorgeous train ride along the coast, but my overwhelming memory is "crowded." We had a drink in one of the fancy hotel restaurants, but only guests were allowed to eat (??) so we found food in the interior upstairs dining area of the Eagle's Nest restaurant. That was perfect b/c the windows were thrown wide open and we were almost outside, but without all the tourists walking by down below.

Day 3: picked up rental car and drove west thru coastal villages. Crazy traffic. Commit to the underground car park in Antibes at the port, it's easy, and there is NO OTHER WAY to park. Looked at the line for the Picasso museum, which I wanted to do, and noped out. Don't know if they book ahead, but we hadn't been sure of our timing. I liked the old town, market, and city walls/promenade better than Nice, TBH, but Nice obv has bigger airport. The tiny Roman history museum was cute (I'm a history buff, YMMV). It would be nice to wake up in Antibes before tourists to have early morning to oneself, but we had a so-so hotel in a different town.

Day 4: Random coastal stuff, got to Aix en Provence on a Friday night and that was wonderful! Dinner under the fairy lights in a square. The pool at Grand Hotel Roi Rene was great after driving (only one we had on the trip), the AC worked and the location was at the edge of the historic area. The gorgeous markets are Saturday morning, and b/c we were right there, we were first on the scene. Absolutely recommend staying in Aix on a Friday night close enough to walk to the markets on Saturday morning. End of May is peony season.

Day 5-7: Arrived in Marseilles (returned car at train stn) and LOVED THIS CITY. We stayed downtown, everything walkable, waterfront was exciting and filled with people. Super easy transit to the Velodrome for the concert and back. Not sure what we did which day in Marseilles, but we liked the "Neolithic Cave Art" experience in one of the waterfront museums. You ride through a faithful recreation of a giant cavern with cave paintings, w/individual narration devices, and the attached real museum with specimens and maps was also good. Recommend. We also did the big fort and its rooftop gardens - great gelato on the rooftop and views, as if the NYC High Line was on top of a giant fort and connected across multiple levels. There are many random rooms built into parts of the fort with historical or art displays, and I spent a lot of time exploring (my friend went off on her own, she was historied out).

Sunday dinner in Marseilles is a challenge w/out reservations! Very few places in the downtown core that look interesting are open Sundays, and those that are, are very full. We ended up at an ok falafel place, but it was random b/c our first three on the list had been closed or laughably full.

While I would be happy to go back to Antibes for the Picasso stuff, and take someone else to see Aix en Provence on a Saturday morning, I felt like Marseilles was the best part for me. I would start there on any subsequent trip to the area.