ガイドをありがとうって英語でなんて言うの？

Any of these compliments should suffice.

"Thank you so much for everything you have done for us." explains you are very grateful for everything the tour guide did.

"Thank you so much for the tour, you were fantastic." thanks the guide for the tour and tells him/ her that they did a really really great job.

Guide is one of the words that can be used as both a verb and a noun.
When you say I want to thank my guide, you are using 'guide' as a noun.
But when you want to thank your guide, you may say:
Thank you very much for 'guiding' me around. In this case, you have used 'guide' as a verb in its present participle tense.

The verb to guide means, 'to assist (a person) to travel through, or reach a destination in, an unfamiliar area, as by accompanying or giving directions to the person'.
However, if used as a noun, 'guide' means 'a person who shows the way to others, especially one employed to show tourists around places of interest'

All of these phrases are a way of saying Thank you to a tour guide for the service they have provided.

It is a good to show your appreciation when someone has given you a good service
Hope this helps
Jane :)

Tour means an informative journey around place. In this case you are grateful that the tour guide showed around and provided really helpful information.

To thank your guide when traveling abroad, you can say:
"Thank you for the great experience."
"Thank you for being a great guide."

These two ways can display how grateful you were with the tour guide or demonstrate that you enjoyed the tour. Below are ways that it could be used in a sentence.

This has been one of the best vacations, we enjoyed the tour you gave us, you were great.

You have been one of the best tour guides, we enjoyed all of the activities.

We really appreciate you, you were a fantastic tour guide.

Cheers and ta are informal ways of saying thank you to a tour guide or to someone who has done something for you.

Cheers can be used in any part of the English speaking world.

An example of what may be said is shown below.

"Cheers for the tour"

To express thanks to a guide for showing you around a place you can use the sentences above.
We can also call a guide by the name 'tour guide' they show you a tour of a certain location and also guide you along the way by providing information about the place.

Both will convey your thanks perfectly well.