Two suggestions
Tyler's in Palm Springs has great sliders and perfect fries every time. Get the combo with an Arnold Palmer and your day has been made.
In Cincinnati, there's a place called Zips which claims to offer the best burger in town. I've had it. It's damn good. Try one. Zips is near The Echo which offers its trademark fish sandwiches on Fridays only. Zips on Thursday, Echo on Friday, and then Skyline on the weekend and I may never leave the city.