Complex sentence: To walk the trails there is a $2.50 day-use fee (cash or check, no credit cards) for adults 16 and older; children are free; entry is also free with a California hunting or fishing license.
Split into simpler sentences: To walk the trails there is a $2.50 day-use fee (cash or check, no credit cards) for adults 16 and older; children are free. Entry is also free with a California hunting or fishing license.