I say eat whatever you want! Just stick to the timing given to you by your OB/hospital. If it's something that's apt to give you heartburn, take it with your normal heartburn meds if need be.
I'm thinking I want to go out for something pretty fancy if possible, or maybe I'll have my mom make me the same meal I had on my birthday before DS was born (I went into labor at midnight the night of my birthday), because that is my all-time favorite, braised beef over mashed potatoes.