Finally! I'll admit, I may be biased bc I'm an east coaster who prefers most burger joints over In N Out, so I shall leave you with these tips.
The portions are fairly sized so if you don't want to be too stuffed, try going for a single burger, share the fries, and most definitely treat yourself with a concrete and/or a milkshake. That custard of theirs is unique and complements their burgers very well, just sayin. Enjoy the taste of NYC!