There where a few spelling errors and some instances of awkward wording, but it was fine overall. I made some corrections and cut out a little of what I thought wasn't needed.
"I am looking to reserve accommodation for single room in your hotel for three nights for twenty guests. We will be arriving on the 5th of July which will be on Friday afternoon, and leaving on the 7th of July evening.
About the meals, I would love to have dinner on Friday evening, and on Saturday and Sunday have breakfast, lunch, dinner. In addition, there are two people who are vegetarian and four do not drink alcohol, so I would need you to accommodate that.
I would also appreciate if you could provide me with one conference room and three smaller seminar rooms which has basic equipment, such as: overhead project, flip chart, VCR ...Â
Finally, I would also like to know about the activities that we can take part in during our stay for more fun and relaxation.
Thank you for your prompt attention to the above, and I look forward to receiving a letter confirming my reservation."
Also you may want to specify the days and times you need the conference room and video equipment.