If you can have someone put the bleach in great, otherwise get a floater and put trichlor in it to chlorinate the pool while you are gone. (Trichlor DOES have it's uses!)
Adding a dose of polyquat 60 algaecide (NOT any other kind) is also good insurance.
Finally consider adding borates to your pool to 50 ppm. Besides the other water enhancing and pH stabilizing effects of borates it is also an excellent algaestat. It is much longer lasting and much less expensive to use than polyquat 60 given that polyquat needs to be dosed weekly and borates only once a year to "top them off" I go away every summer in july for two week, live in Florida, and just shut my pool off for the duration after shocking it. Since I have added borates (since 2006) I have returned to a pool that, while there was no chlorine, there was also NOT a trace of algae!