The current proposal would charge groups a deposit. The deposit varies with the size of the group. They would get the money back as long as the group adequately cleaned up after themselves.
Officials say the idea promotes responsibility.
"We want to be encouraging use of the Greenway, not discouraging," said Parks Board President Jay Ritter. "We think the deposit route encourages wiser use of the Greenway and make sure we have wise use of the Greenway and people that take care it."
The parks board plans to vote on the issue in two weeks.