VirtualTourist.com said the park was chosen No. 1 for its list of the "World's Top Five Hot Springs" for its comfortable 104-degree water and free admission.
The Blue Lagoon of Grindavik, Iceland, received second-place honors for its powerful waterfall and optional floating massages.
The Web site picked the Kawaguchi resort of Kawaguchiko Town, Japan, No. 3 for the expansive meals offered at the resort and stunning views of the snow-capped volcano visible from the springs.
Lake Bogoria, Kenya, made the list for its rich wildlife, including flamingos and zebras, while San Kamphaeng of Chiang Mai province, Thailand, finished off the list with its hot spring cooking area.