The answer is simple: the medium of your choice. You may be wondering how come all mediums are accepted. The reason is simple; we have experience teaching all media. We have been teaching drawing, painting, color theory, and perspective for more than 30 years in an art school in Ottawa, Canada, and mostly to beginners and intermediate. Therefore, we know our stuff! In addition, since our groups comprise eight participants only, we can offer personalized instruction.
But if you ask which medium we recommend. It depends. We suggest oils for beginners as they are easier to manipulate. Oils have plenty of time to dry under the Tuscan or Provençal sun. A cobalt dryer is also helpful to speed up the drying process. But, if you are an acrylic painter, acrylic is the answer; and do not forget your medium retarder. As for watercolors, since they are the most challenging medium, we strongly recommend that you buy very good pigments, Arche paper, and very good paintbrushes.
As for our university graduates (BFA  and MFA), they say, “Eh! we never learned that at the university.” As for our established worldwide renowned artists (such as Vicky) and our university graduates (Kim), respectively very well internationally and locally known, they saw our art workshops as a “retreat”, a time to reflect upon their new series while conversing with every one of us.
So, therefore we write “all levels”, “all media” and “art retreat”. And let us not forget that Mount Fuji was painted thousands of times, but what makes “your” Mount Fuji unique and authentic, is simply “you”.