If you've got little ones, you should hike up the gravel path from the pier to get to the Coupeville park. They have nice grass and trees and new play equipment including swings a slide and a jungle gym.
This is also where they have outdoor concerts in the summer.
Favorite thing: walk down the main docks. There's the Coupeville Cafe and Harbor Store at the end of this dock. In this photo, my mom, myself (at age 12) and my sister are looking over at the seagulls scavanging for food along the shore.
Favorite thing: look out for Mt Baker on the horizon during a clear day, or do a bit of beachcombing while the tide is low!
Favorite thing: Walk down the street and explore all the cute little shops and restaurants. The main street runs along the waterfront, and some of the shops are located on the docks.