Wisconsin Parents!

Hey there, fellow cheese heads. We have a 3.5 yo and are planning our first WI Dells vacation to an indoor waterpark. They are all quite expensive.....except Mt. Olympus. Has anyone actually stayed there? The last time we went was pre-baby and stayed at the Starlite (summer) and went to Noah's Ark. Obvi, this isn't possible in October. Is Mt. Olympus too affordable for a reason? Any actual experiences are welcome.....but only if you've stayed and played there (indoor facilities).