Watching a movie, reading a book, call your friends (since it's free!), go out for a coffee/tea...make that ice tea I guess ;o)
Go to movies or shopping, visit old souk if you haven't been there (check out locals dancing in the on Fridays),
join one of the QL clubs,
get a nice camera and start taking photos as a new hobby (share with us if they're good),
go for language classes (maybe Arabic would be good?),
get a new cook book if you enjoy cooking (make sth nice and invite friends over for dinner-feels gr8 when every1 really enjoy something you have prepared!),
take a ride to Al Khor and have a picnic on the beach (it's really good place for that),
open "Mahraba" and check out what extra activities are available here and where you can join...

Now, I hope you have chosen at least one option! ;o)

Cheers!

If you're looking for a problem, you're probably gonna find one.