Home is a good place for exercising, too. Pushups, crunches, Roman/Russian twists, squats, dumbbells lifting, triceps extensions, latteral raises, a whole bunch of core exercises don't require gym. Just self-discipline.
Also, go for a walk, jog or biking. Home or gym movement won't replace fresh air and some sun.
There's really very little need to go to the gym period, you can put together a nice little home gym for a few hundred dollars and craigslist. Personally I like the gym but it's not always convenient so I have a pretty decent home gym that I've put together over the years. The best exercise is a 1h walk 3-4 times a week....in the summer I'll move some of the home gym out into the yard, my wife gets grumpy but working out in the sunshine is pretty great.
Also, go for a walk, jog or biking. Home or gym movement won't replace fresh air and some sun.