There are so many things you can do in SL, you can go to awesome parties, explore amazing places and appreciate some SL art, you can basically do anything you like.
There's always something to do here so if you get bored, just look in the events and find something you like, or search in the search bar for some key word of something that interests you, like "disco" or "music" you'll have lots of fun.
SL is only boring when you don't really know it well, i remember when i was a "noobie" i used to have alot of down time in second life but once you get the hang of it you'll be always busy going from one place to another