For an even more adult setting, you can also pay to use the Vibe Beach Club for the week. This area of the ship has a private entrance, and once inside it has a bar, lounge chairs, and other great accommodations away from the hustle and bustle. If you want to enjoy this, you definitely need to book is as soon as you board, as there are no pre-bookings at this time.
For those of you unfamiliar with Norwegian, it is a freestyle cruising experience. Most cruise lines have set dining times, early and late, with a show either before or after. You have a set location to dine with the same staff each night, and depending on how large your party is, you are sometimes seated with other guests. Freestyle Cruising is different in that you schedule (or don't schedule) when you want to eat, see shows, and who you sit with. If you are a party of 2, you can have a table for 2. If you want to dine with friends, great! There are 3 dining rooms, and you can eat in whichever "floats your boat" each night. And just as you are used to when cruising, everything is included (except soda and alcohol, of course). Have 2 or 3 entrees if you like -- or all 4 desserts -- no one is judging. Taste, Savor, and the Manhattan Room were all fabulous. The chocolate lava cake was probably the best I've had.