This thread is so random, I was JUST up there today. I was going to start my ride in Essex and ride up to Newbury and down Plum Island. Needless to say nothing went as planned, I got chased by a crazy man on a bike and I didn't even get my fried clams at Woodmans...
But if you are interested in doing something kinda active, check out ERBA, it's right across the street from Woodman's. You can rent kayaks and paddle to Crane's Beach. It's an easy trip and the beach is beautiful. I think they even have sunset paddling trips that are supposed to be really nice.
Also if you are into shopping, you can drive up to Newburyport, they have a cute town center with shops and all. And the Peabody-Essex museum is supposed to be amazing, though I've never been there myself, I've heard nothing but good things.
Have a great trip!
It's only worth it if you're having fun