Some rooms are basically outside by the pool. You'd be fine...but you'll want to take something so you can have lunch. It has to be a cover....doesn't have to be effective...sheer, holes, large knit, etc are acceptable.
I know Stephanie has scampered through the lobby a couple times with no top on the way to our room, although this might be a bit frowned upon by the hotel and it certainly isn't a habit. This has only happened following an afternoon by the sexy pool or a Boobs Cruise. And I'm pretty sure she got a drink from the lobby bar once in the afternoon the same way. I don't think you'll have a single complaint from other guests or likely even management with a little topless jaunt between the pool and your room, but I would avoid the lobby for sure, and a light cover in the restaurants will definitely work. It's nothing to get too concerned over.