Do parents have to pay when they're not going in the water there displaying their children?

Yes but not full price

Yea. $10

Yes. It's a 10.00 fee even if you're not going to get wet. Check Groupon for deals on admission. Make sure you bring towels, you can purchase towels there for 25.00 per towel so your better off bringing your own. If you're a Vet or active duty you'll also get free admission to the Aviation museum for yourself and 4 others plus you'll get a discount on your admission. Hope this helps.