How Do I Write a Letter to Introduce a Travel Agency?

I say this a lot here - as far as I know, no one reads letters of introduction these days.
You promote your business with local advertising, and by being on as many internet sites as you can for both local and far away viewing. You need tons of internet skills.
People want to know what you offer and for how much cost, and they want to see it all quickly, without hype or long wordy promises or descriptions.