I really like OOB. It can be busy and a little weathered in some areas but it’s an old seaboard town. Pristine is a few towns south if you must.
Nothing better than a quiet day on the enormous beach, a few beers on the end of the pier, dinner at The Landmark, and few arcade games with the family as you stroll around. I think I won a yo-yo for my wife with my arcade tickets. Big fun. Day trips, lunches to Portland, the outlets, Kennebunkport are easy. But you’ve gotta embrace the older, New England, seaside motel or you’ll not enjoy it.