It's a classic that everybody loves, whether they admit it or not! 1 and 2 were great but I'm not a big fan of the later ones without the original cast and umph.
Read, watch the TV, play puzzle games on your Nintendo, tidy the house for you Mum, Knit, surf the Internet, learn some more computer skills. Have Fun.
You can call a friend over and hangout. If you have a bf/gf you can call them to keep you company and have fun. Or just watch movies or clean or anything you want to do.
Just because you are home alone, it does not mean you should do something that could potentially get you in trouble.Is there something you do that your family gets annoyed with? Maybe you play drums...