EMERGENCY!
It's not an ambulance type emergency but it is a writing emergency. You need to get that letter written right away.
As with a medical emergency, the sooner you do it, the less you have to do.
If, as soon as you get home , you dash off a quick email, you can just write something like
Dear Count Dracula,
Thank you for having me - it was wonderful - I absolutely loved it!
Count Dracula will be most gratified that you couldn't wait to thank him. Of course, the risk is that he will immediately invite you for next year, so if you really don't want to go, you'd better be ready with a pretend long-standing invitation from your old family friends, the Frankensteins.
If you weren't able to write immediately, you'll need to produce something a bit more thoughtful.
Even if you've had the best time of your life, it's sometimes difficult to know how to start, so here is a suggestion for a simple but effective letter.
The important word is 'thank you', so begin with that. Then think of at least three things you enjoyed, and you can write something like this:
Dear Count Dracula,
Thank you very much for having me to stay.
I loved hearing the bats whirling round the castle in the evening.
I loved being allowed to stay up all night.
I loved sleeping in a coffin - it was amazingly comfortable.
You were a wonderful host. Now I'm looking forward to going back to school so I can tell my friends about my visit to Transylvania!
No need to mention the horrible food, the creepy servants or the strange noises.
Remember the first rule of thank-you -letter writing: do it NOW.
Rachel