Poás Volcano National Park is a National Park that covers an area of approximately 16,000 acres (65 km²); the summit is 8,900 feet (2,708 m). One of the attractive features about Poás is that you can get all the way to the edge of the crater.
The main crater is 950 feet (289 m) deep and is quite active with frequent small geyser and lava eruptions, however...