Take a walking tour on your own or sign up for a guided tour if one is offered. You may be able to take part in a class or presentation.
Some nature centers have exhibits such as a colony of bees in a glass case or aquariums.
Large cities offer zoos. Museums may have dramatic displays of live insects. Or there may be an exhibit where you push a button to hear the sound of an animal. Some large nature centers may have a greenhouse or perhaps a butterfly garden. There may be a class in such things as bird watching or rock and fossil identification.