You will have a catheter in place immediately after the op as your legs won't work for you to get to the toilet. They'll take this out for you within the first 24 hours and then it's time to get moving.
Ring for help lifting baby until the catheter is out though as you really shouldn't be twisting across to the cot and lifting him up even if you feel like you could do it.
I bought some cheapy shop and market stall old lady type pants that came right up to my waist (and possibly a bit higher) in a size larger than I'd normally wear.
They were really easy to attach the doubled up pads to as there was plenty of fabric in the gusset region and it made sure that the waistband never wiggled itself down to the scar area to irritate the wound. Buy plenty of pants as I was changing them twice a day due to blood loss as despite the pads there always seemed to be some getting onto the pants.
Pack highwaisted stretchy trousers (tracksuit/leggings type) to wear if you don't want to be in pj's/nightie all the time whilst in hospital.
I found it helpful to use a hairdryer on the wound after washing so that I could ensure it was clean.
Constipation from the painkillers is quite bad but I found that eating a whole bag of white seedless grapes (plus quite a bit of other fruit) sorted it out naturally.
Hint to someone who might be thinking of sending a bouquet that a fruit basket gift would be very welcome, I ate everything bar the pineapple whilst still in hospital (although my family helped when they visited as they are all fruit vultures)
You might have dissolving stitches so there is no need to have them removed later. They didn't shave me but my minge doesn't come up very far, some people say that they were dry shaved with a bic razor and they wished they'd wet shaved that area themselves at home (just the top bit, no need to go mad)
As you will be in hospital longer than for a normal birth you could take birth announcement stationery stamps and your address book and use the time that baby is asleep to get that done (It is not easy to catch up on your own sleep in hospital due to the noise and interruptions). I also took a pack of M&S "thankyou" cards and wrote them the day after visitors had brought gifts/sent flowers so that was already done before I got home.