Everyone should split the cost except for the groom.
If you trash the limousine in anyway, you will have to pay for the damage
Some of the limo buses have stripper poles in them. Hire a stripper to cruise around and dance between clubs.
If you're getting a large bus ask about bringing cases of beer.
Bring a cd of your favorite music assortment. That will be more fun than trying to find a good radio station.
Many of the drivers work solely for tip money. If he does a good job, tip him well. I always give at least $100.
Pickup some kind of finger food for the ride that won't make a mess.
If you have a bunch of stops to make, mapquest the trip for the driver. Don't assume the driver will know how to get to your destination.
Have all the guys meet at one person's house. Have the limousine pick you up there.