Hi there--
Depending on the age of your LO, you can do all sorts of arts and crafts things - Play-doh, finger paint, coloring, etc. Also, if you check out the "Toddler Activity" sticky at the top of this forum, one member had a great description of different "stations" that she did for her toddler that would definitely burn some energy. How about dancing around to music? We're got a bunch of CDs here that are guaranteed to get DD1 moving around.