HI Graham,
Just ansewerd your other question about drinking. No you can't use pools from other hotels but Treasure Island has a pretty good pool.
http://www.destination360.com/north-...re-island-pool
If your into shows I'd recommend seeing the show
http://www.destination360.com/north-...tere-las-vegas in your hotel.
Also outside they have a free show nightly called sirens its set on this ship with some s e x y dames.
http://www.destination360.com/north-...e-island-siren
Write back if you have more questions.