I'll start with a few tips...
1) Get up at 6am and take your towel out to reserve a chair or chairs on deck and then go back to bed. Otherwise, you won't get a deck chair anywhere near the pool area.
2) WARNING: Do not take a $70 taxi ride around any of the islands. Instead, just hire a taxi to take you to where you want to go. A Party of 2 will save money at $7pp per ride.
Single Inside - this is all you need on this cruise. Plenty of room, plenty of closet space. We had 2 in the room - my wife and I. We were on the 10th floor and had instant access to elevators, the pools, the hottubs and Lido Deck (9) dining. Best cabin location by far.