Gloves and rubbish bags will be provided, but bring your own drinks and snacks. Also, this is a forest reserve so hopefully contains many animals, some of which may be bitey, so take the usual precautions.
Official info from Groundspeak is below:
Get ready for a classic win-win situation from the geocaching playbook: lend a hand to improve the geocaching game board (a local park, trail, or geocaching-friendly location) and earn the 2014 CITO souvenir. It’s easy and rewarding.
It all happens during the 2014 CITO Weekend on April 26 and 27. Everyone who logs an “Attended” at a Cache In Trash Out (CITO) Event earns this year’s CITO souvenir for their Geocaching profile. So start planning your event now!
During a CITO Event, geocachers search parks, trails and forests to earn a smiley—but they’re not looking for geocaches. They’re clearing litter and trash from geocaching-friendly areas around the world. On CITO weekend, thousands of geocachers will walk away from their events with bags of trash and a sense of pride. They’re preserving the natural beauty of our world. It’s often more than litter clean up. Some CITO events remove invasive species, plant trees or build trails.
Join the geocaching community movement. CITO events are held all year long, but you’ll have plenty of events to choose from on April 26 and 27. Last year, over 13,000 geocachers from more than 30 countries combined in the annual worldwide environmental effort, which is tied closely with Earth Day.
More info here: http://www.geocaching.com/cito/