Right on the Prom  north of the Turnaround is the Seaside Aquarium (200 N. Prom, 503/738-6211, 9 a.m.–5 p.m. daily Mar.–Oct., 9 a.m.–5 p.m. Wed.–Sun. Nov.–Feb., $7.50 adults, $6.25 seniors, $3.75 ages 6–13). It’s not quite the Oregon Coast Aquarium  (find that in Newport ), but if you’re not going to make it that far south, it’s an OK introduction to sea life for young children.
Back in the era of the Daddy Train , this place served as a natatorium but was converted to its current use in 1937. Today the pool is filled with raucously barking seals.
In addition, a hundred species of marine life here include 20-ray sea stars, crabs, ferocious-looking wolf eels and moray eels, and octopuses.