Define a special filling algorithm which adds walls to any space to tile it with small hexagons. When a beehive generates, use this algorithm to fill it with hexagons in order to make it look like a honeycomb.

Remove the beehive from the Wizard’s Tower. Bees are too easy for a late game player. If, instead, it should be kept (maybe a Wicked Witch of the West reference?), the beehive should open into the central area of that floor, so the bees can come out and attack the player.