Search Youtube to find hilarious vids of stupid things, then make posts in the General section of this forum.
I was thinking of recommending the first part! You can also surf different sub forums here. Or login to a chatroom as a girl! You will surely have some good time (I am not saying this from experience, it just came to my mind ).
I like to go shopping for new websites at sitepoint, 99% of the time I never buy anything but I always like to have a look at what's for sale.
Exercise, you will look better, feel better, and you will not be bored when you are done. Its what I do.