We were just at the bcv's and had friends come and visit from Sebring, we used the pool, golfed, had dinner at Cape May Cafe and went for a drink at the Boardwalk. They also spent the night. All we did was let the front desk know we had guests. It was great.
The life guard/attendant usually asks to see your room keys. If your party does not exceed the room occupancy limit, I would ask/call the resort before hand (If it's OK, note the persons name).