K.L.
We loved Great Wolf Lodge. In fact my son plays "GWL" at home regularly. I chose it based on online reviews and comparing GWL, Kalahari, and Wilderness. After also talking to some folks I was glad to rule out Kalahari - people like, but said for older kids. The part of Wilderness for kids that we wanted to go to was across the lake and would have required driving at the time we were staying in the Dells. We would have stayed in the main part of Wilderness - so that might be a factor. GWL had stuff for us but most importantly plenty for out 3 year old to do. The toddler area is great.