My advice is...
Relax and enjoy the nap. As a mom of 5, it's probably the longest rest you've gotten in a long time!
I only have 4, but I still appreciated the uninterrupted snooze!
Seriously though, if you can handle 5 kids, this will be just another thing to get done and I'm sure you'll be back to getting things done in no time.
My practical suggestions - bring chap stick, sunglasses for the ride home (just in case you can't shut your eye all the way), sweatpants to wear home (you'll have an incision on your belly and a soft, stretchy waistband will feel better), slippers with a non-slip sole so you can be up and at 'em as soon as they let you and a picture of your family. I found the last one to be very motivating.
Good luck and I'll be thinking of you on Tuesday. Is there someone who can post to give us an update on how you're doing? We tend to be a group that worries and some of us don't need any more grey hair!
You'll do great! Do something fun with your family tomorrow!
Lori