The rooms are incredibly expensive and the level of service is really quite low unless you're in one of the special suites. That being said, I guess the pool is the only main draw to this property. If you really have to go up, consider going to the Ku De Ta bar instead for a drink - you do not have to pay for admission and you can spend that on a drink instead.
With regards to the pool, I'm afraid there's no other way to use it unless you choose to stay there.