Since 1946 the glass bottom boat tours at Aquarena Center in San Marcos have given folks of all ages an "in-depth" look at the timeless beauty of the San Marcos river.  As the boats glide across the crystal waters of Spring Lake at Aquarena you'll see why ancient peoples revered this place.  You'll also see some of the 1,000 springs that form the headwaters of one of the most beautiful rivers in Central Texas; and catch glimpses of the inhabitants here too.  Bluegill Sunfish, Channel Catfish, Soft Shell turtles, all call Aquarena home.  Back on shore, you can get eye to eye with these river dwellers when you visit the Aquarium.  Bring the family to share a walk through the grounds and enjoy the natural beauty of Texas Native plants.  Learn together when you visit the Archaeology Exhibit, Wetlands Floating Boardwalk or the Texas Rivers Center exhibit hall.  In the Endangered Species Exhibit you'll see some of the fish and reptiles that make this part of the river a federally declared critical habitat.  Aquarena is the place to visit for families who share a love of nature and want to teach their kids the value of natural beauty.  Aquarena is located in San Marcos, TX: take exit 206, Aquarena Springs Drive, west from IH35.  Open 7days a week.