It's never too early to have them realize how hard it is to get that money and how quickly it goes. They could even figure out how much money they earn in an hour, or minute. Eating out, they can calculate the cost of the meal. Don't forget the tax and tip. Historical places in the area could be a part of a day trip.
Children can sometimes see dates on buildings and figure out when that building was built.
Postcards and books from the past are always interesting. And not too far away, in Norwich, there is the museum on the NFA campus. Science can be found anywhere. Check out the area sights. When you go to the beach or take a hike this summer you can find some interesting shells, plants or animals.