<P> In June 2010 it was announced that the Austin area would host the Formula One, United States Grand Prix, from 2012 until 2021 . The State pledged $25 million in public funds annually for 10 years to pay the sanctioning fees for the race . A Formula One circuit was built at an estimated cost of $250 to $300 million, and is located just east of the Austin Bergstrom International Airport . Circuit of the Americas also plays host to MotoGP World Championships from 2013 . </P> <P> The summer of 2014 marked the inaugural season for World TeamTennis team Austin Aces, formerly Orange County Breakers of the southern California region . Austin Aces played their matches at the Cedar Park Center northwest of Austin, and featured former professionals Andy Roddick and Marion Bartoli, as well as current WTA tour player Vera Zvonareva . The team left after the 2015 season . </P> <P> The Austin Parks and Recreation Department received the Excellence in Aquatics award in 1999 and the Gold Medal Awards in 2004 from the National Recreation and Park Association . Home to more than 50 public swimming pools, Austin has parks and pools throughout the city . There are several well - known swimming locations . These include Deep Eddy Pool, Texas' oldest man - made swimming pool, and Barton Springs Pool, the nation's largest natural swimming pool in an urban area . Barton Springs Pool is spring - fed while Deep Eddy is well - fed . Both range in temperature from about 68.0 ° F (20.0 ° C) during the winter to about 71.6 ° F (22.0 ° C) during the summer . Hippie Hollow Park, a county park situated along Lake Travis, is the only officially sanctioned clothing - optional public park in Texas . Activities include rockclimbing, kayaking, swimming, mountain biking, exploring, and hiking along the greenbelt, a long - spanning area that runs through the city . Some well known naturally forming swimming holes along Austin's greenbelt include Twin Falls, Sculpture Falls and Campbell's Hole . Zilker Park, a large green area close to downtown, forms part of the greenbelt along the Colorado River . Hamilton Pool is a pool and wildlife park located about 30 minutes from the city . </P> <P> To strengthen the region's parks system, which spans more than 29,000 acres (11,736 ha), The Austin Parks Foundation (APF) was established in 1992 to develop and improve parks in and around Austin . APF works to fill the city's park funding gap by leveraging volunteers, philanthropists, park advocates and strategic collaborations to develop, maintain and enhance Austin's parks, trails and green spaces . APF fosters innovative public / private partnerships and since 2006, has given over 145 grants totaling more than $2 million in service to the greater Austin community . </P>

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