If you don't want to swim but want your children to swim do you have to pay the 29.99 fee as well? What does each activity cost?

All guests entering the park must pay the entry fee. Caregivers are free when accompanied by a person with disabilities. This it what it say on the website FAQs.

Yes I believe you have to pay even if you're not swimming. Costs for extra activities like the VR headset are on the web site. They also rent lockers (price varies by size), sell goggles, and you can rent single or double tubes.