What kind of business do you have and how long have you had it?
How many people are on your mailing list (approximately)?
What have they bought from you?
Are your clients more budget or quality conscious?
Would you like a retreat combined with tours of that city or country, or just the retreat itself planned for you?
Have you ever led a retreat before? If so, can you tell us a little more about your experience?
Are you prepared to spend money and time marketing your retreat to your list?
Do you have strategic affiliates/partners to whom you can market the retreat as well?