Children love zero entry pools.
There are quite a few more than when my children were young in the 70's and 80's.
My health club even has a zero entry pool and waterslides.
The very first zero entry pool I took my children to opened in 1977 in Oakland County ,Mich.(Where I live.) We had a great Parks and Rec commisoner who envisioned wonderful parks for our county.
From this website:
http://www.mackinac.org/depts/ecodevo/article.asp?ID=1857
Waterford Oaks, completed in 1977 (constructed for $1.7 million) boasts an outdoor wave pool, two water slides, an aquatic play land for children, ten tennis courts (including two platform courts), a full BMX dirt bike racetrack, a toboggan run, shuffleboard areas, and several pavilions. In 1997, 73,250 people visited the tax-funded park during the summer. Adult nonresidents were charged $12 for day passes, adult residents paid $9, children's passes were $6, and groups and seniors received special discounts. The winter toboggan run attracted 13,429 people at respective rates of $8, $6, and $4. In 1998, the park increased its summer rates by $1.
Here is more info about the waterpark:
http://www.oakgov.com/parksrec/ppark/waterford_wp.html
The park was a favorite when my children were growing up and my grandson now 4 enjoys it also.