The Florida Building Code section appears to limit the use of the pool wet deck anytime day or night: FBC 454.1.2.3.5 #1 "No food or beverages in pool or on the wet deck." Since there are access requirements for the pool, it appears as if the wet deck is considered as part of the pool and subject to the same rules. So, if the hotel closes the pool at night, then the wet deck is closed too. So, you can't close the pool but leave the deck open. If the deck is open, then so is the pool - which requires lighting.