Funday National Park is an awesome park. Big sites with lots of privacy, water and sewer hook ups. Alma is only 5 minutes away with lots to do there, there is a great on the water lobster shop in Alma if you like FRESH Lobster, Hopewell Rocks is only 1/2 hour away good for a day trip, lots to do in Fundy National Park itself.
If you have some time on your way down or on the way back, there is a nice pictureque trialer park in Notre Dame du Lac, Quebec just on the Quebec/New Brunswick border. Really nice with beautiful scenery of the lake and mountains, I would have loved to spend a couple days there but we were on a schedule to get to Nova Scotia so we pulled in at 8pm and left at 9 am in the morning, waaaay to rushed.
If you like trendy, expensive and touristy Cavendish, PEI is the place. Not really my cup of tea but my wife had to see Anne of Green Gables. My son and I did a mackeral trip with joeys Deep Sea fishing out of Rustico which was an absolute blast! Lots of fishing opportunities in Cavendish, stayed at Cavendish Provincial park, wasnt a big fan, the beac was nice, the RV area was cramped feeling , maybe I was just spoiled from Fundy national park, I honestly wouldnt go back to Cavendish provincial park but there are lots of others in Cavendish.
Have fun, lots to do lots to see, take your time, something I wish we had more of when we went down there last summer.
Maritime people are the nicest people you will ever meet in your life. Makes me jealous of their lifestyle, very simple with good values.