Please help with plans!

This is definitely something I should do on my own, but I have no ideas (good enough ones at least). My 1st wedding anniversary is Monday the 12th. My husband is going through finals in med school, so doing a lot is not an option and we definitely cannot go out. What is something easy I can do for us? I only have Monday to get it ready because I don't want my husband to know I'm doing anything! He thinks we are only going out next weekend, so I need a good surprise!