We visited the park in March and you can walk the entire loop in 20 min. It is not a strenuous walk at all and costs $10 dollars per adult. The petrified redwoods are very interesting and the forest is tucked away near Calistoga. There is a small gift shop where the clerks are very helpful and kind. This is not a large forest so, prepare yourself to just enjoy the simple atmosphere of nature. Great restaurants nearby in downtown Calistoga.