"Nobody goes there anymore. It's too crowded." Yogi Berra
I know, I know, so hipster - but it's true. I'm not the biggest HP fan in the world, but it just annoys me when waiting two hours to get in there.
If OP is staying that close to Hilton, I'd guess you're either at the Gateway, Baymont, or the Holiday Inn down on University. I think the Tailgaters restaurant in Gateway isn't terrible, but I haven't been there - no clue if they do catered breakfast. The gas station across the street has a Burgie's Coffee in it, that's pretty decent coffee. Um... there's not a whole lot down in that part of town. Probably buzzing across Airport to get to Dublin Bay is the safest bet, or going out west and getting either Wallaby's or getting an amazing gyro at Pammel Grocery. OR you could just order Casey's Pizza and get it carryout - people from out of town would never guess that gas station pizza is some of the best in Ames, and probably wouldn't be packed.