Everything on your list is good advice save the first one. There is a VERY good reason you leave the hospital the day after your surgery. Actually, several. The first and most important reason is something called a nosocomial infection. These are more commonly known as MRSA and VRE (Methicillin / Oxacillin resistant Staphylococcus aureus and Vancomycin resistant Enterococcus) infections. These are hospital born infections and VERY hard to treat. If you get an infection at home you are in much better shape (antibiotics will work just fine on those). The longer you stay in a hospital the more at-risk you are for one of these infections. Also, another antibiotic-resistant bug that is popping up is Tuberculosis. Not as likely to spread as MRSA or VRE but you are still at greater risk in a hospital setting than at home. This is the main reason they send you home early. Since you were healthy going into the surgery you are less likely to be at risk for complications and more likely to recover just fine. Your one remaining kidney should take over perfectly fine.
Also, would you rather convalesce at home, in your own comfy bed / couch watching your massive amount of cable tv / movie collection / reading your favorite books / eating your OWN food or in a boring hospital room with limited tv, no books, and hospital food? HELL NO! lol! My blankets were also waaay warmer than the hospitals.
So, actually, it is a VERY good move to leave the hospital the day after your surgery. I do not think, though, that it is a good idea to leave the AREA of your transplant center (going cross-country) while convalescing. If you do happen to have a complication, you need to be able to get back in to see your transplant docs.
My qualifications for the above info, btw, are that I am a Microbiologist working in the very hospital I donated at (made an awesome cover letter!). I get to see the MRSA and VRE screens as well as seeing positives. No matter how awesome of a hospital you go to (and mine is pretty high up there - we're looking to displace one of the top ten centers / schools within the next 9 years) the risk of infection is there.