Hi Michelle, All the answers to your questions, plus more can be found in the specs tab on each item page. To answer specifically for the Shark Park, typically you may have up to 3 players in the splash area, 1 sliding, 1 climbing the slide, and "3" in the bouncer (that's a lot for the bouncer; really depends on age and size). It really doesn't matter what size the players are in the splash area, as long as they are not on the actual inflated structure, as most of the ratings are based on the air supply to the inflated portions. Home use Inflatables have a maximum user weight of 100 Lbs per user. Based on play habits, typically 12 year olds would enjoy the splash area more so than the inflated features. Sincerely, Blast Zone Support