3. Lake Austin, Texas
Part of the Colorado River, Lake Austin is a lovely reservoir in Austin where city dwellers seek relief from the heat in the summer months. It, along with six others, makes up the Highland Lakes, and while its main purposes include flood control and power generation, Lake Austin is also a popular spot for recreation; visitors can fish, boat, and kayak, easily making it one of the more laidback, yet equally magnificent lakes in North America.