If you mean on your check in or check out days, before you are in/after you are out of your room, most anyone will. If you mean "a resort I can go to to swim at without staying there," you'll have better luck at one of the area waterparks.
Have heard of business travelers with layovers being able to use resorts by paying a fee for the day. Only have 4 hours in Orlando and was hoping to cool off with my toddler.