Gardens of Ynn + Dolmenwood

My players recently helped rescue the illegitimate son of a fairy noble, and this fairy is going to give them a gift: access to their magical garden, which I plan on being the Gardens of Ynn.

Does this sound like a good idea? Has anyone used Gardens of Ynn in conjunction with Dolmenwood, or in fact at all? What advice would you give for using it, particularly as an extension of Dolmenwood?

Thanks!