If there is a way to call them, that would be the first step. Ask them if there are grills and/or covered areas.
If not, you can always rent a canopay. THis way you can still be outside BBQ'ing and also be covered.
As for food, you can bring, chips, pretzels, potato, macaroni and cole slaw salads. There are also bugers and dogs. Don't forget the ketchup, mustard, pickles, rolls, mayo, etc. PLUS lots ot napkins, wipes, plates, cups and plastic ware.
You might have to borrow some coolers not only for the food and drink but also ice for for the drinks.
Make sure you have plenty of large garbage bags for garbage.
Bring some citronella candles (they make them now so they do not smell gross) so the bugs stay away.
I hope this helped, at least it is a start
Let me know what else you may need.