National Museum of Mathematics (MoMath)

Rooms with a queen and an overhead bunk, or four bunks, so everyone sleeps in one room sleepover style.

Classic play equipment and a water area when it's running, plus a public restroom close by.

Ground-level equipment in an area just for toddlers, so a new walker isn't dodging big kids.

A small playground with seal-shaped sprinklers. On a hot day, that's the whole visit (bring a towel).

Follow the old elevated train tracks, spot the public art, then flop on the lawn for a break.

A gated play space for younger kids with low swings, small climbers and a spray shower when it's hot.