Duet is a sim for photographers and it is perfect for cuddling and dancing. Joining the group provides rezz rights and admittance to some areas and I think the L20 are really fair. When you enter you get a notecard with the sim rules as well as a list what to do at Duet, and there is really a lot to see and to experience. Riding the Freefall is for sure the unique attraction. This 8 minute space ride is crammed with animations, visual and audio special effects.
Duet website - http://duet-sl.com/
Second Life destination Guide http://secondlife.com/destination/duet