Geocaching is an outdoor recreational treasure hunt.

Cache availability and sizes are dependent on those who place and maintain them.
Erratic Rock State Park features at least one traditional size cache.

Erratic Park is a participant to the geocaching alternative sport, Tangleboxing, which was created and is hosted by Yamhill County and City of McMinnville Parks and Recreation.
Tanglebox is an outdoor summertime treasure hunt.
Tangleboxes have been hidden in eleven different Yamhill Park sites.
The tanglebox is clearly labeled, but hidden.
Geocaching is an outdoor recreational treasure hunt.
Cache availability and sizes are dependent on those who place and maintain them. Erratic Rock State Park features at least one traditional size cache.
Erratic Park is a participant to the geocaching alternative sport, Tangleboxing, which was created and is hosted by Yamhill County and City of McMinnville Parks and Recreation. Tanglebox is an outdoor summertime treasure hunt. Tangleboxes have been hidden in eleven different Yamhill Park sites. The tanglebox is clearly labeled, but hidden.
Erratic Rock State Natural Site