Have a movie night
Go to your nearest Redbox and pick up a few movies you both will enjoy. If you want to do this even cheaper, just stop in the local library. Buy a 2-liter bottle of soda for $1 at a dollar store and a couple packages of party mix/popcorn, etc. and you're set. Make sure you snuggle; the whole "watching a movie" experience is always better when snuggling is involved.