Tide pools?

Hello from Canada!

My partner and I are taking his mom on a trip to Scotland, including a few days in Orkney (mid April) and we are very excited!

We are staying in Kirkwall, and have three full days to spend exploring Orkney. Please note we won't have a car but are fine paying for taxis or other transportation.

We plan to spend one day exploring Kirkwall, we have one full day booked with Orkney Tours to visit all the major spots, and that leaves us with one last day to fill.

As someone who lives 14 hours (via car) away from the ocean, I always love the opportunity to explore beaches and tide pools. Looks like we will be a bit early for sea kayaking season, are there any amazing spots we can spend the day exploring tide pools and the sort nearish Kirkwall?

Any other recommendations are greatly accepted as well. Thank you so much :)