The Langham, Boston

Waterfront hotel with a big indoor pool and a Kidventure package with DIY cupcakes and aquarium tickets.

Harborfront hotel with a heated indoor pool and an outdoor pool deck, next to the Greenway playground.

A four-story Giant Ocean Tank circled by a ramp, with penguins below and sea lions outside.

Costumed reenactors and replica ships, where kids get to throw tea overboard.

Three floors of hands-on play on the water, from a giant climbing structure to a real Japanese house and a bubbles room.

Pizzeria known for slices so big each one is a quarter of a pie, with the choices behind the glass changing daily.