Zilker Metropolitan Park is the green heart of Austin, Texas, a sprawling 358-acre expanse along the Colorado River and Barton Creek that holds one of the city's true crown jewels: Barton Springs Pool. For locals and visitors alike, Zilker is where Austin comes to swim, picnic, paddle, hike and gather, an enormous, beloved urban park that manages to feel like a genuine natural escape right beside downtown.

Barton Springs Pool is the headliner. Set within the channel of Barton Creek and fed by the fourth-largest spring in Texas, the three-acre natural pool holds a steady 68 to 70 degrees year-round, cool and clear and bracing on a hot Austin day, and it's one of the most iconic swimming spots in the entire country. Beyond the developed pool, Lower Barton Creek offers a series of free swimming holes and shallow areas ideal for families, and the adjacent Barton Creek Greenbelt strings together more pools and waterfalls upstream.

The park is far more than the pool. Zilker's vast lawns host picnics, festivals and frisbee, its trails and the hike-and-bike paths along the river draw walkers and runners, and the creek and river offer paddling and wildlife along the water. It's the site of Austin's biggest events and everyday recreation alike, a place that genuinely belongs to the whole city.

A couple of practical notes help. Barton Springs Pool keeps its own hours (generally open daily except Thursday mornings for cleaning) and charges a seasonal entrance fee for the developed pool, a standard city parks charge, though Zilker Park itself and the Lower Barton Creek swimming areas are free. The spring-fed water stays cold all year, which is refreshing in summer and bracing in the cooler months.

Summer is peak season for swimming and the park is busiest then, but the constant 68-to-70-degree spring means people swim Barton Springs year-round, and spring and fall are lovely for the lawns and trails. Getting there is easy, including by the number 30 bus to the Barton Springs (Zilker Park) stop and a short walk down William Barton Drive.

Bring a swimsuit and towel, water shoes for the creek's rocky spots, sun protection and a picnic, and cash or card for the pool if you're swimming the developed section. Between a legendary spring-fed pool, free creek swimming holes, miles of trails and lawns, and its place at the center of Austin life, Zilker Park is an essential Austin destination.