We don't have a car so walking is the only way and we do it in all weathers -- and walk/bus everywhere else too.
Definitely take a snack for the end of school, scooters (and once they can ride them, bikes) are a godsend, waterproofs, all good.
We often go to the park on the way home from school (just in case they aren't getting enough exercise ).
The dcs are excellent walkers and never complain about having to walk anywhere because to them walking is the normal way to get around.
There are times mid-winter when it gets dark almost at home-time, when it's absolutely pissing down, when the streets are covered with ice that you think, oh, I do wish I had a car. But that's more than compensated for by the thought that my kids know their neighbourhood intimately because they walk around it all the time, and they have time to stop and look at things, and talk to people (and me and each other) on the way home.
Most of the time I confess I look at children strapped in the back of the car and feel rather sorry for them. They're not learning about roads and traffic, and they don't have the freedom of the streets that walkers do.