I'd go to a city, mall, somewhere with a lot of "stuff". As much as you can enjoy the sounds of outdoors, I feel that because the visual doesn't change too much in the woods, it's very easy to focus on the sound. In a social setting where everything/body is in motion, the visual can be overpowering.
GO SEE A MOVIE. Yes, for sure - see a packed movie, something where there will be lot of people - listen to the film, listen to the reaction. See an action movie, like Hanna - see what sounds get a reaction. See what reactions happen without a strong sound to back it up.
For added fun, have your wife quietly describe the action to you and see if someone gets angry, and then very sheepish when the realize you're "blind".
Go out to eat as well - again, somewhere busy. Go alone and see how it goes.. ask someone to read you the menu.
This may get me in trouble here, but do something mind altering. Drink a few beers, or whatever. It always alters my ears a little. I imagine without your eyes it will be more.
Also, despite what I said above, go out and sit outside for a while. Try at night - there's a lot going on that happens when you're asleep.
Figure out how to keep track of your money: Only use cash. Follow the guidelines here.
Clean your house, make sure the things you NEED, like your beer, toothbrush, wallet, phone, etc are all there and you know where they are.
Plan your days well, but leave some time for you to just chill, listen to some music, browse your favorite website with WebbIE.
Keep wet wipes with you - you will be using your hands a lot and will probably be touching a lot of things you wouldn't normally.
Make sure you have a sleep mask so you don't accidentally wake up and forget you can't see. Get blacked glasses for going out and some kind of walk aid. It's tiring to keep your eyes shut, just keep things going.
You're not really blind, and this isn't a life-in-the-shoes exercise, but you still need to prep as if you were going to be blind.
Drive, brawl, run with scissors.
WHEN TO STOP:
Common sense should dictate that one :)
Good luck! I look forward to hearing what you experience!!!