Had one for some years now. Good advice from an old hand (which we didn't always follow) is to have some idea of which job you're going to do when you go round, otherwise the day disappears in pottering. To me that's half the reason for having one. At this time of year, leave marrows on doorsteps under cover of darkness - that way they can't ask you not to give any more!
I have a beautiful bunch of dahlias and gladioli which were given me as we walked past the allotments in Whitby just before leaving - allotment holders are most generous!
Finally, if you have kids don't plant things they don't like hoping it will be different when they've watched them grow - it isn't. And peas will never make it to the pot; they taste too good straight from the pod.
Much luck and pleasure.