Where are the best spots to visit in Hawaii for a 5 day vacation?

My husband and I are looking for a natural, quiet honeymoon to be less resort-like and more peaceful. We’re looking at Maui, but other spots on the islands might be good too. We’d like to hike, kayak, swim at a beach, see mountains, and I’d also like to camp at least one night at the Black Sand Beach on Maui. What series of places would be best to make a short 5 day trip to and see the most of what we’d like to see? And how best should we plan flights and/or travel between islands if we do more than just one island? What hotels are good and not too touristy resort-like?