What do to in Arrowhead/Huntsville? (Camping)

I’m going camping with my partner this September and I’m making a list of activities to do and places to visit while we are there.
Any must do hikes?
Swim spots?
Fishing spots?
Stores?

Restaurants is a big one, I’ve been seeing a lot of mixed reviews online about Huntsville restaurants.

Also general camping tips and advice is welcome.

Thank you!