Of course, do things that you haven't done with her yet, or maybe reach out and do something that she wouldn't expect
Light bondage - Use handcuffs, ropes, or a silk scarf to tie her up
Feathers - Tickle every inch of her body with a feather. Add that to the light bondage and you've got yourself a winner
Domination - Treat her like a bad girl. Don't go too extreme with it, but be aggressive. Maybe fake a rape scene?
Oil - Before you do anything, you need to put some kind of protective cover over your sex-surface
Oil up your woman. Then, after you finish oiling her up, have her oil you up by rubbing her body against yours. Then you fuck like rabbits
Fantasies - Doctor, Sheriff, Cowgirl, etc.
Other people - Bring in another woman, or bring in another man so you can DP her
Public Sex - It's been mentioned. It is worth mentioning again
Might Get Caught - For an added thrill, do it in a place where you might get caught. Somewhere where you still have privacy but somebody could walk in at any second
Toys - Self explainatory
Marathon - See how long you can go for
Random Sexation - Say you might walk past her innocently at home one day. Rip into her and do her on the spot.
Wow. I'm not a perv or anything. No, I like to think of it as being sexually creative