Camping in Yellowstone/Grand Tetons

I can't speak for the RV park at Colter Bay because we don't camp there. We camp in the regular campground and all the spaces have fire rings and they sell wood at the general store. They also have one loop that has electric hookup, 30 amps I believe, set up for disabled folks, but part-way through the day they open them up for regular folks. Colter Bay is a wonderful campground as is Gros Ventre, but we have never stayed there because we fish Jackson Lake most of the time we are there and Gros Ventre is quite a ways from the lake whereas Colter Bay is just that, a bay on the lake so it's five minutes to get the boat put in the lake. However, September may not be the best time to spend time there, if you like the water. Usually there is a call on the lake to take the water down by 15-30 feet to go downstream to Idaho so the lake is not as high as earlier in the summer. However, there are lots of other things to do in Grand Teton, Jenny Lake and Hidden Falls with Inspiration Point, go to Slide Lake over in the Gros Ventre, and spend a bunch of time hiking, if that's your thing, in some of the prettiest area in the world, at least in my opinion. Then, either early in the morning or late in the evening, before dark, driving around looking for wildlife usually pays dividends. As noted above, if your friends need 50 amp for AC, then it's not necessary. We have found, over over 48 years of going to Grand Teton, and Yellowstone, that the evenings cool off and AC is not necessary.