What collaborations has Pamela Holt undertaken with Postcard Adventure Group for women's travel tours?

I'm sorry, but the available content doesn't directly address any collaborations between Pamela Holt and the Postcard Adventure Group for women's travel tours. Pamela Holt is a well-known travel expert and host of the series "Me, Myself & The World: The Art of Solo Travel," but specific collaborations aren't mentioned in the content I have.

Would you like to know more about Pamela Holt's solo travel tips or her travel series? Or perhaps you're interested in general advice for women traveling solo?