Take one photo to remember the baby weight. Relish shopping by yourself, especially shoe shopping. Kids have no patience for shoe shopping.
Spend more intimate time with your s/o like watch movies, cuddle more, go to the mall with him, because after the baby is born it's not just you two anymore
I agree with shower at your own pace! Sleep as long as you want one morning. Enjoy a nice meal either at home or your favourite restaurant as you will rarely get to eat hot food again!
Go to à fancy restrant with your boyfriend/husband
Get a prenatal massage.
Go to the movies.
Take a stupidly long hot shower.
Get a haircut - an expensive one, with a scalp massage and all that good stuff.
If you get a chance, go see your favorite band perform, and let that baby dance along with you.
Make a few videos of baby in your belly to watch when baby gets older.