The following information is something that I came across on another site. For choosing a person who will babysit your tank you want someone you can trust and if possible familar with reef keeping. If you are like me and don't have anyone that you know is familar with reef tanks, than you will at least want someone who is detailed oriented. Have a number that they can contact you at if anything seems wrong with your tank, and if you are a member of a local club I would see if you could provide them the number of a club member or two that could help if the need arises. Also I would provide them with the forum website so if needed they could ask any questions or concerns if something doesn't seem right. I would create a checklist for them to be able to follow. General observations how does the water look is it cloudy? Are there any dead fish? Any odd noises?
Have them check and make sure the pumps are running, show them before hand how to tell.
Have them check the temp to make sure it is alright, if it is getting close to your max temp have a plan of action for them to follow. Turning on the ac, floating bags of ice in the sump etc.
Have them check the skimmer and show them how to clean and empty the skimmer cup.
Topping off, if don't have an ato show them where you store your rodi water, how much needs to be added. If you do have an ato have them check the reservoir to see if needs to be filled.
Have them check the specific gravity, show them how to use your refractometer or hydrometer and I would write down what level you keep your specific gravity at.
Feeding the fish ( good idea on using the the pill pack) or can use individual baggies
If you use dosing additives I would cut back to those which are necessary and would have it proportioned out already so that they don't have to measure it out. The proportioned additives I would leave by the check list, any other chemicals would have put away so that nothing gets added to the tank accidentally.
I would also have saltwater prepared incase something major happens which requires a waterchange to be carried out. Also you than have water ready for when you get home to be able to do a waterchange with.
I would also make sure that all electrical cords are labeled cleary, so that way if they do need to unplug anything they are not guessing. Also makes it easier on you when you need to disconnect something.
For preparation of possible power loss having a couple of battery powered air pumps that turn on automatically when the power goes out and have them already set up to go while you are away. Along with that some fresh batteries that are out incase they are needed.