Submarine

A real World War II submarine you go down inside and walk through end to end, which is the kind of thing kids talk about for years. The passages are genuinely tight, the bunks are stacked beside torpedoes, and an audio tour explains what life aboard was actually like. An adjoining indoor museum holds torpedoes, a Poseidon missile and submarine artifacts. It is at the Pearl Harbor visitor center so it slots in alongside the memorial and aviation museum. Not suitable for strollers and small kids need to manage steep ladders.