Farther Afield...
Interested in Sleeping Overnight on a Boat?
Three boats in San Francisco Bay permit this:
Other:
Information on ALL the Jamborees planned in the UK is available at this listing which includes events as far in the future as 2009.
Or, if you're just looking for someplace to stay that isn't as far away as one of the World Centres, try the Southern Vancouver Island Guide House in Victoria, BC.