If you haven't had the chance to check out Lands End yet, or even if you already have, I think it would be a great place for a meetup! Beautiful views and close to a 100% guarantee that you'll see a dolphin or 7—what's not to love?
We could hike there along the Coastal Trail and then picnic once we get there! Bring your favorite snack (and of course your favorite wine) and a blanket. And don't forget to bundle up, it can get pretty windy out there :)
I have a spot in mind that will be perfect but it's a little "off the beaten path" (literally), so if enough people are interested, I can post detailed directions!