Yes they really do "keep" children out of the Solarium.
If you're looking for peace and quiet on a sea day, try the library.
If you are looking for fun, don't miss Boleros at night.
For Adults only - it's not a secret (exactly), but don't miss the Quest.
A previous poster was describing the Moonlight Bay Lounge...a less smoky way to get across Deck 6.
You will have a great time on Rhapsody - very friendly environment...