Which unique collaborations has Mommy Poppins featured in New England travel guides?

I'm sorry, but the available content doesn't directly address unique collaborations featured in Mommy Poppins' New England travel guides. However, Mommy Poppins does offer a comprehensive travel guide to plan a vacation anywhere in the US, including New England.

Would you like to know more about the general features of our travel guides or are you interested in specific activities or places in New England?