the best thing to replace addiction with is not one thing, or a few, but all of life. if you try to replace you may just end up switching addictions.
when i sobered up i filled my days with work, meetings and sober friends and relationships. it's good to fill some of the empty hours with distraction, but don't underestimate the power of just sitting with yourself and noticing your emotions, cravings and reactions and your newfound ability to work through them, and working on new coping skills and strategies!
good luck.