For the next couple of weeks, you'll save cardio for the weekends. Monday through Friday is devoted to the gym, but Saturday and Sunday are about getting your heart pumping and your body moving!
Now, you could get on a treadmill and run in place for two hours, hating life, but you've earned better after all of the hard work you've put in so far. Get out of the gym.
I don't want you to treat cardio like a chore, because it doesn't have to be. You probably already love lots of things that are cardiovascular in nature: touch football, waterskiing, Nerf tag, swimming. The possibilities are endless, and they're all a lot more fun than staggering along on a treadmill, getting nowhere.
Use this time to sneak in some bodyweight ab work as well. By doing bodyweight moves, you can avoid the gym for the entire weekend, keeping your workouts wherever you want them to be.