I did the low/no carb last November and lost 20 pounds in two weeks. We would eat carbs on the weekend, and none during the week. It was great, I really want to do it again.
i say you go for the punching bag... maybe a nice speedbag... and if you like coordination games.. play some dance dance revolution.. get a nice homepad and start playing
or even play stepmania with a usb pad... i got 1000's of songs i'd be happy to give!
hit the benchpress.. i find doing low weight high reps does some justice..
shadow boxing with some weights....
buy some ankle weights and wear them on a daily bases.. there's tons of things you cuold do.... that take small amounts of time that could help you