Seeking Tourist Visa Cover letter sample.

As mentioned in the title , i am looking for a tourist visa cover letter sample , I am a permanent resident the US, any help Would be highly appreciated.
Thanks

You want to address:

What your plans are while in the UK
How you will support yourself during your trip
An itinerary of sites you are seeing, etc.
When your return flight is
Your employment situation in the US (preferably a letter from your employer stating you are due back at work on x day)
How you will maintain your home back in the US during your stay (evidence of a mortgage or lease)