GF is not an issue for me or my SO, but my favorite celebration restaurant is Los Andes. I believe they have GF options.

I wouldn't go there on the day, since it books up well in advance. If you and your SO can celebrate on another day, I'd go then.

I avoid Valentines Day reservations at all costs, but I have gone to a BYOB place or a nice brewpub (that doesn't take reservations) when it absolutely, positively had to be on Feb 14.