I highly recommend going to a large empty grassy field (soccer or football, etc) and riding like a wild demoness! Slow, fast, uphill, downhill, standing in the pedals, sitting, pedalling with one foot, holding the bars with one hand, making sharp turns, deliberatly lifting the front wheel, trying to "peel out", and so on!
Hitting the mushy spots and bumps and such on the field will do wonders for your handling skills, and if/when you topple it won't be a disaster as you will land on the grass!
Don't under-inflate the front tire, go play instead!
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson