There is no better way to celebrate Earth Day than with a trail run at Estero Llano Grande State Park in Weslaco. Run either the Nature Chaser 5K or 10K route through the 250-acre park that features the largest wetland environment in the World Birding Center network. Experience the sites and sounds of birds, butterflies, turtles and if your lucky -- get to see some of the resident alligators in their natural habitat.