The Number One Last Minute Valentine's Day Idea for the Guys:
This one will take the most work, but if you can pull it off, we can forgive the procrastination on account of how romantic it is.
Cook her a nice meal. From scratch.
I'm talking tablecloths, lit candles, wine, flowers, and a legitimate meal. No whipping up your famous 5 minute sandwiches. If you are completely incapable of cooking, and are okay with lying, you can do the 'fake out with take out,' but for your own good, hide the evidence!