I wouldn't recommend it for a 1st party, my daughter had her 9th there and it was great but you'd be better off having a 1st party at home as they will just love playing!
Do you really mean 1st birthday? Not really sure it will be great value as a 12month old will not really appreciate a pool party as an older child would - is it a party more for your family/friends?
Most 1 year olds want to crawl/shuffle around the floor, play with the paper and ribbon and have a bowl of cake/ice-cream - then after and hour or so they are enhausted from the over stimulation and need a nap
I am looking at celebrating my DD's 1st birthday at Grand Hyatt and really like the idea of a swimming party for kids. The amount that they are charging is a bit steep - so I want to make sure that it will be all worth it. Any one had previous experience attending a kiddie pool party at the hotel? Appreciate any feedback. TIA