Dear…
Please allow me to extend my thanks to you for inviting me to participate in your annual golf tournament this year. It was so much fun and I was thrilled to be there.
I was so impressed with how well organized everything was. It seemed nothing was overlooked, which only added to the pure enjoyment of it all. I must say that the highlight of the day for me was __(briefly describe something that pleasantly stood out for you.)__.
All in all, it was a superb day. Great golf mixed with great people, laughter and fun. Thank you again for your invitation. I enjoyed it immensely.
Sincerely,