FJ - you asked about what to do in Melb to entertain E for a day - you know i'm not a Melburnite, but i have heard there is a wonderful family friendly Aquarium type place to take kids. Hopefully a Melb BB-er will know the proper name of it and fill in the gaps for me.

The one place i do know about, have visited several times (but not for many years) in Melb is an organic gardening estate called CERES. Great place to wander around, lots of stuff on display.