Answer:
You can read a good book, go for a walk, meet friends, watch a movie, play board games with friends or family, play games (on PC, Xbox, PS, PS2, PS3 etc.).
More analysed:
a) Stay at home, put a CD on the stereo, listen to soft music, take a good book and stay all day on your sofa.
b) Make a call to your good friends, invite them at your home and play board games, watch a movie, play games on PS(1,2,3), Xbox (normal or 360) and even sleepover.
c) Go with friends for a walk to the neighboorhood. Or go all day outdoors for trekking, mountain bike or even walking.
d) Go for a ride with your bicycle alone or with your brother/sister, your other half, with a friend.
e) Or you can sleep until 12 o'clock and see television all day. But if I were I'll chose something like a, b, c or d.