This explains it pretty well

It's been fun. And so much more.

Today is my final day. I'm voluntarily stepping down after 11 years as a reviewer for Geocaching.com, with about 10 of those years as the reviewer for Iowa. It wasn't an easy decision but after considering things for the past few months, I came to the conclusion that it's time for someone else to step up and assume these duties for Iowa. I'm involved in several different volunteer opportunities as well as being busy with work, recreation and exercise. One of the volunteer activities I've been devoting more of my time to is Team River Runner, which helps heal disabled veterans by getting them into kayaking. I notified Groundspeak of my decision last week and they have made arrangements for other reviewers to begin handling the Iowa queue beginning tomorrow (Monday, Sept 9). To all the geocachers I have emailed, spoken to on the phone, or met in person over the past 11 years, I say thank you for the good times -- because they truly have been good. I very much enjoyed working and playing with each of you to get your caches published. I will always cherish the friendships I've made all across the state. Iowa geocachers are the best! I'll also cherish the friendships I've made with my fellow reviewers around the world. But this is not good-bye. Even though I'm no longer going to be a reviewer, I'll always be a geocacher. I hope to see you again at upcoming events. And maybe we'll run into each other on the way to a geocache somewhere. Meanwhile, I have to get back to the review queue one last time. It's been another busy weekend with lots of new caches submitted so I want to tidy up the place before I turn it over to the next person.

All the best,
Ken