I would do a 50% water change the day before you leave, feed the morning you leave and have fun. as mentioned, fish can easily make it 2 weeks without food. They certainly don't get fed daily in the wild. I'm sure some species may fare better than others but they should be fine.
As for feeding, the week bofore, I would cut back to feeding every other day including the morning you leave.
If you decide you feel you have to have some one check on your tanks, you can pre-measure normal amounts of food into cups and then just instruct them to put a cup in every so many days. Hide the rest of the food so they can't add extra. Feeding every 3 days should be plenty.