The most important ingredient for staying away from alcohol is positive peer pressure.  What helps, is to find a group of friends who have also made a decision not to drink.  To get more specific on fun: go on a shopping spree at a dollar store; memorize your favorite dances and perform them; participate in a scavenger hunt; go hiking; play capture the flag at night; make a cardboard house; play laser tag; go fishing, day or night.  There are things you did as a kid or something that you wouldn't just think of to do maybe with a group of friends. 
    It's hard to fight underage drinking where I live because of the local university, there are a lot of students who have their own housing.  For me, I do have a strong group of friends, and it's really not as bad as it seems.  I'd rather ponder the long-term consequences of drinking instead of thinking of it as a way to have fun on a whim.  I'd rather be a positive role model in someone's life. 

Fire, that's awesome that you're so motivated.  A lot of my friends still struggle with smoking and drinking.  But you're right, sometimes it's nice to have a completely awesome time without being drunk, on drugs, or stoned.  I swear, people get so caught up thinking life sucks and there's nothing to do, but there really is.

I quit drinking a while ago and I dont do any drugs, but I really do have just as much fun as the drunk guy next to me. People think it's much more fun just being drunk and crazy with everyone else. But really if I just grab a redbull and have some music it's a blast and I have no regrets the next morning.

Even after 4 years of no smoking or drinking I still sometimes feel down in the dumps and bored.I find it helps to do something new and differant.Accually posting on this site is new and differant for me and as I type this my boredom is going away.Talking to other addicts also gets me out of my self-centeredness Self-centeredness is a commom symptom of addiction.By talking to each other we help each other to deal with our addiction