Washington State Parks is offering a free day on Saturday, Oct. 10 in observance of World Mental Health Day. The free day is the 10th of 12 free days in 2020, when visitors do not need a Discover Pass for day-use visits by vehicle. The free days do not include overnight stays. This is the 10th of 12 free days offered in 2020. The others are Wed. Nov. 11 and Friday, Nov. 27.