Check out the 9 courses set up this year for a fun summer. The only thing you have to do is sign-up "on time" and pay. Recreational Sports takes care of the rest.
The entry form is available online, or you can stop by the Fitness Center Main Office and pick one up.
http://www.icrecsports.com/FitnessCenter_Site/
https://www.ithaca.edu/intercom/article.php/2006050515030251