If you (or your kids) have ever wanted to operate a backhoe or crane, look no further than Lemieux Island. A nice surprise in their Doors Open display is the "heavy machinery" display outside complete with volunteers who aren't just willing to let you sit in their machines, but will turn them on and let you operate them as well (shown here are the boys using the outside controls to operate a small crane). Both kids and adults welcome!
The tour itself was a bit too in depth for my 7 and 9 year olds BUT...when we asked if we could skip the tour and just have someone take us in side to see the water system, the volunteers were totally agreeable. We got a mini private tour!