If you did not include the fact that guests are expected to remove snow while paying money to stay in your space, and it snows, you will not like the results. This family will not be pleased.
I would pay someone to be on notice to plow and/or shovel them out. Of course, you might not be able to find anyone who is willing to be on consignment. Around here, you either sign a yearly contract or they are not interested.
Perhaps you could consider finding out what a local company would charge for snow removal even if they aren’t willing to take you on as a client, and offer the guests this amount back in the event that they need to shovel?