A few weeks ago I took my daughter to play at a park near where I grew up and was taken to as a child. I remember it up to the age of about 6, at which point the park wasn't really safe enough to go to (even during the day) and my family moved to a different area (not due to the park I should explain). The park has changed beyond all recognition (oddly I remember the toilets and they're still there) but it struck me as a shame that there was no record of that park from my childhood to look back on.
Given how "cheap" digital photos are in that once you have the camera it costs basically nothing to snap anything (compare that to the old rolls of 24 or 36 exposure films which cost loads) you have no excuse not to snap away for your children to look at 30 years time in amazement at how everything has changed. I've been photographing parks, local streets, parked cars, high streets, buildings which have stood for years but were about to be knocked down, and hopefully my daughter will look back on these in 30 years time in amazement at how much has changed. I can't say she's too bothered at the moment though... she's only 2.
But do make sure you snap away - these are all "Your Special Memories" after all.