Some writing on the letter explains that you should 'read letter', and when you've finished, 'burn letter'.

May 3,2009
Dear Allen
Thought you could use a little something from the Caribbean.
Feel free to pass it around.
I'm actually connected from the island of Jost Van Dyke in the British Virgin Islands
I'm sitting in a restaurant called Corsairs enjoying the sun and sand of our last stop before heading North into the Atlantic.
I hope you are doing well
Kevin