1234, Main Street
Boston, MA 02123
01 April, 2005
<Recipient Address Goes Here>
I/we have recently returned from a trip to [destination], and I/We found something very interesting that you simply must include in the next edition of your [name of the travel guide book]
I hope this new information will be of great use to every traveler going to [Name of the place].
If you need more information on what I/We found there, you can contact anytime at [Phone number].
Thank you for your time.
encl: <List of enclosed items goes here>