Other than hiking, swimming, fishing and kayaking (that last one there are actually no rentals)
I have on the list:
Card games (whist, poker, etc)
Water gun fight
Scavenger hunt
Tabu
Guesstures
What are some other things we can do? No kiddie games, there will be adults 21 and up for this group camping trip.
believe it or not truth and dare can be fun! charades too!
Geocashing if you have a few GPS units.
I think what you have sounds great.
I always bring a bike or two with me when camping. It makes it easier to explore the whole campground and get some fresh air and time to yourself in between meals. A headlight can extend your riding time well past dusk.
fishing marshmallow and bonfire
Frisbee!