Although nll and I are romantic plenty on other times of year, we have never failed to take advantage of any specials that are actually (surprisingly with some businesses) truly economically advantageous ways to pamper each other (like a spa special with his and hers massages or restaurants that are holding a seasonal special). However we aren't specifically doing those things because of Valentine's day, just taking advantage of it. And we usually avoid going out on the actual day because things are so over-crowded then.
Looks like my contacts on polymatch fizzled out, but then, that makes poly dating not different at all from singles dating.
To anyone who is planning a big St. Valentine's day - have fun!