"Thank you so much for your help this weekend! From what I hear, everything went off without a hitch. It gave me great peace of mind to see all the guests arriving right on time! (And thanks for double-checking about the address of the Boathouse...that would have been interesting if the guests had been dropped off all the way up in Bolton Landing!)
Please pass on my compliments to the driver, and thank you again for an excellent experience! If there's anyplace online that I can recommend you, let me know...I am happy to do so."