We now have a 19-month old son. I bike him around in a bike trailer, when we have the time. I also commute to work 5 days a week by bicycle. I try to find time to road or cross ride on the weekends, but to be honest, he's at such a fun stage I'd rather be there for when he wakes up. I feel a bit guilty, as I was a pretty avid roadie. But, I can't complain that I still get to ride 5 days a week, at a minimum.
I also haven't driver regularly since 2002, had to drop him at our friend's/sitter for a few months. Ugh, I truly hate dealing with angry, lawless motorists. Thank goodness we now have a nanny come to us and I can ride from home to my office. I think all of his schools will be within walking/cycling distance too. I honestly thank my luck every single day that I can ride a bicycle almost everywhere.