Providence Childrens Museum
Great place to go with kids of all ages. Many interactive areas for toddlers, preschoolers, or school age children. They even have an infant/toddler area specifically for children under 4. Children learn through play. Many of the rooms and activities are geared around local culture, and local history. They even have an IWAY area. Admission is very reasonable and you can usually get discount passes through your local library. The place is on the smaller side, which makes it wonderful for toddlers. You can see and play with everything and still be home in time for naps.