Free for children under 4. Look for discount coupons from local hotels, Duval Street kiosks, and from trolley and train tours. The oldest attraction on the island, the Key West Aquarium is a modest but fascinating exhibit. A long hallway of eye-level displays showcase dozens of variety of fish and crustaceans. See delicate sea horses swaying in the backlit tanks.
Kids can touch sea cucumbers and sea anemones in a shallow touch tank in the entry way.
Then you'll witness the dramatic feeding frenzy of the sharks, tarpon, barracudas, stingrays and turtles. Key West Lighthouse Museum . When the Key West Lighthouse was opened in 1848, many locals mourned. Its bright warning to ships signaled the end of a profitable era for wreckers, pirate salvagers who looted reef-stricken ships. The story of this, and other Keys's lighthouses, is illustrated in a small museum that was formerly the keeper's quarters.