The ultimate in busman's holidays would be to stay in the Library Hotel, whose every floor represents a different part of the Dewey Decimal Classification scheme. There's a virtual tour on their web-site and the whole place looks amazing. At the end of last year the Hotel agreed with OCLC to give a donation to a children's literacy scheme in exchange for the right to use the DDC concept. See the OCLC's press release for more details.