The nation’s second oldest aquarium will celebrate its 121st birthday with a day of family-friendly activities on Wednesday, March 19.

Founded in 1904, Waikiki Aquarium invites the public to enjoy arts and crafts, special feedings, games, educational exhibits and more, 9 a.m. to 2 p.m., as it celebrates over a century of Pacific marine education and conservation.

“For more than a century, the Waikiki Aquarium has been a hub for marine education and conservation,” said Waikiki Aquarium Director Dr. Andrew Rossiter in a release. “We’re excited to celebrate this milestone with our community and continue inspiring future generations to care for our ocean.”

During Spring Break this week, visitors of all ages are invited to take part in hands-on activities:

OceanTalk - The free 2025 OceanTalk series kicks off at 4 p.m. March 19 with coral biologist Anthony Burke, who will talk about reef conservation, coral restoration and disease identification. Register.

Discover Hermit Crabs - Interact with live hermit crabs from 12:30 to 3:30 p.m. March 17 and March 21 while learning how they find and switch shells, plus create your own hermit crab puppets to take home.

Coral Reef Fish Class - An exclusive after-hours session will take participants on a deep dive into the world of coral reef fish in the aquarium’s exhibits. Classes will be available from 4:30 to 6:30 p.m. every Monday from March 17 to May 12. Register.

Birthday Beach Cleanup - The public is invited to join the aquarium for its last birthday event in March, a beach cleanup from 10 a.m. to noon March 22. Volunteers will help clean the surrounding shores and parks then enjoy snacks, refreshments and educational games afterwards. Register.

Admission is $12 for non-members, $8 for kamaʻāina and military with ID, and $5 for seniors and children ages 4 through 12.