Beach vacations that aren’t only beach vacations???

My fiancé seems to have his heart set on a beach vacation, I think in his mind when he thinks honeymoon that’s what he sees. I don’t mind beaches but after about 2 days I get very anxious, too much relaxing isn’t very relaxing for my brain. What are some good locations that offer the tropical beach setting but have other non-beach attractions too?

Edit for a few more details: from the US, thinking early-mid Fall, 7-10 days, for budget I’m not really sure where to start having never planned a trip like this, nothing too fancy we’re definitely not in the $1,000 a night bracket.