There are endless miles of hiking trails on Mt. Tam, many of which can be accessed from Stinson Beach itself. For a hearty loop, this route is one of our favorites and combines three of the area's can't miss trails: https://bahiker.com/northbayhikes/stinson.html
This historical inn is only accessible by hiking or biking in and has a beautiful wooden porch that's open to everyone for day-use. N+K spent a night here last fall, and it was magical. Six days a year they serve a pancake breakfast to reward you for finishing your hike, and the Sunday after the wedding happens to be one of those dates!! More info can be found on their website. Let us know if you're planning on going, and we might try to join you!
A bit of a drive from Stinson, but one of our favorite places and completely worth it for the views. Has limited hours when open, and requires walking down many many steps to get to the lighthouse itself, so check out their website for more info before heading out.
Buffalo milk soft serve is a staple of this part of California, and can be found at a few different places, linked here. It's unreal good. https://palacemarket.com/ https://themarshallstore.com/ https://www.coastcafebolinas.com/ @Alexa, let us know if you need more info