The challenge is to see the myriad creatures and photograph them so that they can be identified. Some are fairly large and obvious, while others are so small you hardly can see them even when you are looking at them, and they don't really show their spectacular selves until you are able to enlarge them on the computer!
Bees, of course, are welcome pollinators. There are many kinds which show up on their own schedule over the course of the season. This first one is called a type of Cuckoo Bee.
A large and intimidating member of the bee and wasp family is this next one: the Great Black Wasp. It's body is ~5 cm (2") and its quick darting flight makes one cautious. However it is apparently quite harmless unless you handle it. I've never been bothered by any bee/wasp types even when sticking my camera lens within a few centimetres of their face.