Adventure Island
📍 Greeley, CO
Adventure Island is the indoor waterpark inside Greeley's Family FunPlex, a city-operated facility.
We visited from out of town, and this place was great. The water was a decent temperature. The two big slides are 48" minimum. And the kiddie area is amazing. The third bigger slide has been closed for 20 years according to a lifeguard. Came with a 3 and 6 yo and would come back again.
🏆 Family Action Verdict
Best for families with children ages 3–12. The dedicated kiddie area handles the under-48-inch crowd well, letting older kids tackle the main slides independently. The adult swim break schedule is rigid — factor it into timing if you're visiting with young children who may resist getting out of the water.
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💬 What Families Are Saying
View all reviews →10 Google reviews
Lauren Anderson
“We visited from out of town, and this place was great. The water was a decent temperature. The two big slides are 48" minimum. And the kiddie area is amazing. The third bigger slide has been closed for 20 years according to a lifeguard. Came with a 3 and 6 yo and would come back again.”
Last Great Adventure
“Great place. Great Atmosphere! Family loved it. Outstanding value!”
Deserray Bradney
“This place was extremely fun for my kiddos 6yrs old and 11yrs old. They do adult time every 2 hours which is also great to make the kids use the restroom and hydrate. Cons were too many people and not enough space.”
Reviews from Google
Overview
Adventure Island operates inside the Family FunPlex — a City of Greeley recreation facility that combines an indoor waterpark, multi-court gymnasium, and fitness center under one roof. The waterpark features two major slides requiring a 48-inch height minimum and a well-regarded kiddie area for younger visitors. Structured adult swim breaks every two hours encourage rest and hydration. The outdoor complex adds miniature golf and an amphitheater for extended visits.