Garlic is supposed to be good for repelling many insects, although I don't know if has the same effect on bees. I bought a big container of powdered garlic at Sam's Club and about once a week or after a rain, I sprinkle it around my patio to keep mosquitoes away. It seems to help. Might be worth a try with the bees.
Mrs. U says it probably keeps the vampires away, too.