Plant more gardens, flowers, & flowering trees/shrubs that bloom at different times of the year.
Bees need water too, but they can drown easily. Add a few rocks to your bird bath or make a bee bath with your kids.
Avoid pesticide use. Check out this informational flyer.
Buy local honey!
Don't be afraid of a swarm. If you see one, just contact a beekeeper to come and rehome them. DON'T SPRAY A SWARM!