You can go on a guided Geology Walking Tour and learn about the geological history of the volcanic formations & rocks at Boyce Thompson Arboretum. Be sure to check Boyce’s event page for the the tour date & start time. Admission is $12.50 for adults or $5 for ages 5-12. Children 4 years of age and younger are free. The cost of admission includes weekend guided nature walks. Boyce Thompson Arboretum is located west of Superior on Highway 60 at Milepost #223 & about one hour due east of Phoenix on the Superstition Freeway.