As others have said too much wait for the pool with no wetsuit and its fresh water. Put some wait in the back trim pockets up high will help bring the feet up as well. Hawaii is warmish water and I use a 5mm full suit so I would wear that in the pool and the just compensate for the salt water when you get there. Depending on the time of year you will see guides in 8mm suits with hoods. Temps range from 74 - 82F.