Bees as you know are essential for humans and for the ecosystem, so this spring leave the dandelions alone. Early in the season they are one of the sole sources of pollen and nectar.
Should you further wish to help the bees here is a list of plants that bees are particularly fond of. If you really want to be a bees best friend you could build them a watering hole. Put marbles or pebbles in a bowl add water and voila! Don’t add sugar as this is harmful and do change the water regularly to avoid mosquitoes laying their eggs there.