How to get a good seat @ a sports book?

It's one thing to get there early, a couple hours before a game. The problem is if you want to get something a bit later to eat/drink or use the restroom. Once you get up and leave, there aren't any other options are there? I'm wondering what other people do who deal with this often.

Tim

I kindly ask someone who is sitting nearby to save my seat. This is okay if using the restroom, or returning with a sandwich from a deli or snack bar. I wouldn't ask someone to save my seat if I was going to a sitdown restaurant.