Just like any camping or hiking adventure, take bug spray! Seriously there are 50 million bugs there to take a bite out of you! I bought some from the health food store so that I would feel so terrible putting it on myself every 30 seconds! And don't miss a spot, they know and that is the exact spot they will attack!
If you plan to visit Warren Dunes State Park, you may want to call ahead and check on the wave conditions of the lake. Numerous people have died here due to riptides in recent years. If you do go, make sure to check the flags posted on the beach. Red flags indicate very dangerous water conditions, yellow flags indicate moderately dangerous conditions, and green flags indicate calm water conditions.