Recovery from substance abuse is a challenge. One of the biggest challenges after you have stopped using, especially if you are a young adult, is changing the people and places associated with your drug days. In short, you will have to find new friends, and if you always got high with your friends at the local cemetery, you will not be able to hang out there anymore. Why? It's a trigger to relapse.
Making new friends is very hard. However, that is one of the many benefits of 12 Step Programs. You will meet people who are also working at sobriety and seeking out healthy alternatives to using substance.
Another ancillary use of your time in recovery is reading. Check out the self-help section and become very knowledgeable about the effects of drug abuse on your life. Explore topics such as Co-Dependency; COA's, family roles and anger management.
Also, invest in the Daily Meditation books offered. They will keep you focused on a higher power, which most people in recovery find necessary.