Highly recommend Dash point state park during low tide. We have found an octopus and so many sand dollars. Though this isn’t really a “rocky” place.

One of our favorite rocky places to explore tide pools is deception pass state park -bowman Bay Area.

As well as what someone mentioned above Salt creek recreation at low tide.

Edit to add- Teddy bear cove in Bellingham as well, absolutely love that peaceful place. Though small, it’s so much fun to explore and have a picnic.