I highly recommend this text...
by Chan Khoon San
http://www.buddhistelibrary.org/library ... ?aipath=69
... in terms of the information and background it provides into Buddhist Pilgrimages to the Four Holy Places of Pilgrimage, the Four Places of Principal Miracles, and the general information about the significance, history and people associated with pilgrimages in the past.
I found it a nice stop-gap for activity I would really like to do one day.