We spent a week in Quebec City last Oct, although not with our RV. All of Fonzie's recommendations are bang on, the only one on their list we did not visit was the First Nation Museum. The I'le D'Orleans is a beautiful scenic drive, one highway goes all around the island, with many places to stop and visit on the way, a chocolate shop, couple bakeries, fruit stands...very agricultural based island. It was one of the highlights of our trip. If you go the Montmorency Falls waterfall, the island is a very short drive from there. You can easily do both in the same day, if you get an early enough start. Across the river is Levis, Quebec...and I believe there may be an RV park there as well.
If you google walking tour of Quebec, there are guided walking tours daily. Takes you through old downtown Quebec City at a very leisurely pace, a very easy walk with many stops on the way, where your guide explains history and takes you through many historical buildings. Lasts about 2 hours and costs approx $20-$25...our tour was in English, and the tours are limited to about 15 people. It was an excellent tour.
As far as language....can only speak for Quebec City...we had absolutely no trouble with English language in restaurants, shops, etc...tourism is huge in Quebec City and they cater to it in a big way. Cruise ships dock there, so people from all over the world will be visiting.
Enjoy and have fun.
2016 Chevy Silverado 2500 Duramax
2016 Rockwood 8289WS, Diamond Pkg.