Magical Mom-
I have never actually attended the campfire program my self at Fort Wilderness but am looking forward to trying it at the end of this month. It was my understanding that it was open to anyone but I guess I can't confirm this. You could post the question on the resort board if you wanted to know for sure. There is no actual "cost" per se but they do sells sticks, marshmellows, etc for making s'mores.
The Boardwalk is the entertainment area behind the World Showcase at Epcot. Meaning that if you were there around the time of Illuminations happening, you would be able to see part of the spectacular show. The Boardwalk has a few shops, restaurants, and a "dance hall" with live entertainment. It is themed to look like the 1920s and it's a really unique experience. there is a boat that travels from Epcot to the Boardwalk to the Swan/Dolphin (which are just behind it, within walking distance) and over to MGM too. This is a free way to enjoy the sites.
The Boardwalk really comes alive in the summer when there are carnival type booths set up, jugglers, mimes, unicyclists etc to enjoy as "street entertainment". A surrey bike is a bike for either 2 or 4 people that get to sit side by side. It's a bit of a workout but if it isn't too crowded you can pick up some speed going down the hills.
My personal opinion is that the BEST place to see WISHES is right from the Magic Kingdom itself because you get the full audio presentation. But yes, if you were to go to the Contemporary up on the 10th floor you would get quite a view. It would also be nice to sit on the beach at the Poly or the Grand to catch some of the higher fireworks. The electric Water Pagent makes its way around the lagoon each night too.
Brenda