Olfactory NYC is a cool spot in Seaport (and now Newbury St) where you can create your own custom perfume. They've got a bunch of scents to choose from, and the staff is super friendly and helpful. Plus, they keep your fragrance on file so you can reorder it when you run out. It's a fun experience whether you're looking for a unique gift or just want to treat yourself to a new signature scent.