I agree with all the previous replies. A few old threads that might spark an area of interest for you:
Spring Challenge: find oak bud and flower galls
Ask a Bumblebee - public survey project of plants and bees
I don’t fish either but I’ve found that I can get some decent photos of aquatic organisms in shallow water that have been identified here. And I’ve asked people fishing if I could photograph their fish. I don’t ask everyone I see fishing… just those I strike up a conversation with.