This letter praises a tour company for a tour on which you received excellent service, saw sights you did not expect, etc.
1234, Main Street
Boston, MA 02123
01 April, 2005
<Recipient Address Goes Here>
<time you took tour> <travelers> took <kind of tour> through <agency name>. <I/We> <was/were> absolutely thrilled with the tour, and I thought I should write to compliment you on your excellence.
Without question, <I/We> feel that <my/our> experience on this tour was worth every penny of the money paid for it. Thank you for a wonderful time.
encl: <List of enclosed items goes here>