I use my portable DVD player to watch movies while on the treadmill. :) I try to pick movies or TV shows that have lots of action and that will keep me really distracted from lookin at the time. I've gone from doing just 3 miles to 5 or 6 miles.
Try swimming. It's a great cardio workout and can be lots of fun.
Water aerobics
Join a cardio class such as Kickboxing, belly dancing, or other "non-traditional" aerobics class.
There are tons of DVDs with various types of aerobics programs on them. Try borrowing some from the library to see what kinds you like.
The options these days are almost limitless. Explore and have FUN!