Birthday Celebration!

It's going to be my SO birthday soon &&I want to make it special. He is turning 21 &he is going to Vegas with his guy pals &im still 20 so I'm not going. I already have a dinner planned at his favorite sea food place but I'm thinking about the after. I want to spice our sex life! All we do is missionary, doggie, &me on top. What can I do to make it better? Even though he says he loves what we do I just want something different. What do you girls/guys think? 
​Thank you (: