Seychelles Honeymoon Tips?

Hi!

We've already booked our trip to the Seychelles for middle of June but haven't even begun to start planning (except for booking hotels on Mahe, Silhouette, and Praslin for a few days each). Does anyone have any tips or must-see places/things to do? We're big outdoors/adventure people (he proposed on a hike), and love diving/snorkeling. I've flagged the popular spots to check out, but would love any tips for the less popular spots or off the beaten path favorites!