I have stayed at Mohegan. They have a very large parking area and pretty level. When you get there security will come by, fill out a parking pass (free) and it is good for a week or two. Dry camping but you can run the generator if needed. Can't remember just how long it is good for. Firework are on Wed. nights usually after the 4th during the summer time. Very good show. Shuttle will come by and bring you the casino. I have not checkout Foxwoods RV parking area.