Take pictures of what YOU want to take pictures of. Just remember to think to yourslef, 'down the road, will I still like this snapshot? Think that it was worth taking the time to photograph?'
I agree to not wasting film, every frame costs $, and with Kodachrome there is no 'I'll go down to the local camera shop and pick up a few more rolls for this weekend.' Take the time and effort to think about what you would be proud to say you photographed with your last rolls of kodachrome.