I've been perusing the EarthWatch website at http://www.earthwatch.org and found some expeditions that look like they would be very exciting to work on.
One called 'England's Hidden Kingdom' is in Yorkshire, England. Yorkshire is full of sheep pastures that have never been plowed or greatly disturbed. Underneath these pristine pasture lands are remnants of an unseen world that flourished during the age of King Arthur. The 5th through 7th centuries AD, when the Romans left, an unknown political void was created. One thought is that an independent kingdom, called Craven, thrived in this area.
The site's record includes the transition from Iron Age to Roman Empire and the invastions of the Angles and Vikings. This project is in the fourth year (2004) of exploration into the neglected archaeology of upland Craven. The plans: Survey work, including topographic mapping and geophysical measurements of underground features.
Tools: Theodolites, tape measures, resistivity meters, and grandiometers to help create above-ground and underground maps of the settlement site at Chapel House Wood.
Cost for non-members (2005): $2,195.
Expedition dates June 17-July 1 and July 8- July 22
Boy, what a price for having fun in the dirt.