The rest of your time in Crescent City should also be about nature, specifically water and trees. Much of coastal Del Norte County is covered in dense ethereal forest. The groves near Crescent City that are worth a look and hike include Jedediah Smith State Park and Stout Grove. Both contain reasonably easy hikes for views of amazing trees. If you want to just drive for the views, try Howland Hill Road. It is dirt and can be rough, but any car will be fine, if you just just slow down. There are several beach fronts and water areas, all suitable for hiking, watching seals, and tide pooling. Beachfront Park has readily accessible tide pools and a great playground for kids to simply burn off energy. Other waterfront walks include B Street Pier and Lagoon Creek.
A couple of notes about these areas. Leave seals alone. Hopefully you don't need to be told this, but they are wild animals, federal protected wild animals. They have become partially accustomed to people, but not in the same way as pigeons in a park. Lagoons are a North Coast thing. They build sand in the summer. The rainy season breaks them in the winter and they become temporarily part of the ocean again, only to build back to a full lagoon in the spring and summer.
A lot of hiking and awe will lead to hunger pangs. Crescent City has you covered with good local fare. Two very local spots are worth consideration, Chart Room Marina & Restaurant, and Cristina’s. Christina's is a Mexican place. You might be hesitant since you can get Mexican anywhere. True enough, but this is well prepared so don't hesitate if the Mexican urge strikes. The Chart Room Marina & Restaurant is exactly what it sounds like, good seafood with a local kick.
Since that tragic March day, Crescent City has done much to prepare for future tsunamis and a couple smaller ones have occurred. The people who live here accept this as the trade for living in an area with stunning nature and a quiet relaxing calm. It's a perfect mix of being active and simply being.