A.M.
I don't know much about Millis, but we live right next door in Medfield. I have a 2 1/2 year old boy and a 7 month old boy. We tend to go to the playground A LOT since the weather is getting nice again. I'm sure there are nice playgrounds in Millis. There is also Hopkinton State Park probably about 15-20 min from you that has a huge playground. And for a little longer ride, there is Southwick's Zoo in Mendon (probably 35 min), but SO fun for a 1 year old! They have little petting zoo areas and kiddie rides. And on rainy days we spend a lot of time at the Walpole Mall. There isn't much there as far as stores go, but a great little arcade, a bunch of kiddie rides and a Barnes and Noble with great kids books and story time. Feel free to contact me if you have any other questions or need other info about the area :)