Bee watching can be enjoyable just like bird watching. The more you watch the more you will notice - you begin to differentiate their size, pattern and movements. Certain bee species will usually be found on certain plants.
I live in Australia so I will try and plant more:
Leptospermum scoparium (Manuka or Tea tree or just Leptospermum) is a shrub native to New Zealand and southeast Australia from which manuka honey is made by bees.
Apparently all bees around the world also love: