I was proposed to at Sandbox; married at Saba Rock - but that was many years ago. If I could choose my place today for "the question", it would be the new back deck at Saba Rock. There is one particular, private little deck with a lounge for two. Let the staff there know what you're doing, and they'll make it special. Then the couple can return to Saba Rock for the wedding, and as many anniversaries as they can!