DH and I are about 30, from Indiana, and do not have children.
We flew American Eagle out of Indianapolis to Miami, and then taxied to our hotel for a one-night stay at the Hyatt Regency booked through Priceline for a total of $115 including taxes. The cab ride from the airport to the hotel was around $30. We had a balcony room right above pool and the drawbridge. Really didn't notice much street noise which is very surprising because there is construction everywhere you turn. But, I always take earplugs w/ me on vacation.
The bed was very comfortable, nice down comforter and pillow. The shower in our room did not work properly, but we did not find out until the next morning before leaving for the ship, so we had to take baths, luckily the rooms were very clean and this did not make me feel too uncomfortable. Bayside is not far away via the tram. It was a bit disappointing we expected more nightlife. There was a live band, but they weren't memorable. I'm sure others find it to be an interesting place.