Consistency is the key to success in any endeavor and that is always true when it comes to maintaining your level of fitness. No matter your gains (or losses) to this point, now is the time to start preparing yourself to keep the weight off and the muscle on. The key is to have a written plan in order to maintain your results. The plan doesn't have to be complicated, in fact, the simpler the better, but written goals have the power to help you stay consistent with your workout and healthy diet.
Smoothies are an easy and tasty source of nutrition any time during the day. More than that, you can “hide” some good-for-you foods and supplements in them and not even know they are there. Try wheat germ or a few greens in the next smoothie you make, or even add some Omega 3 or flaxseed oil to pump up the nutrition without changing the taste.
Try putting yourself through your own 30-minute workout on a weekend day. Take some of your favorite exercises and do 15 minutes of strength training and 15-20 minutes of cardio. Remember to keep moving for the entire session.