My suggestion is that to allow yourself to be spoiled by the nurses in the hospital. Start walking as soon as you can in the hospital. Make sure you use the breathing device a lot. Take sleeping pills if they allow you to. Ear plugs may, or may not work. They get rid of the sound, but amplify the valve if it is mechanical. Take something nice to wear and put it on when you go for your walks around the hospital. Rent the TV and take your laptop. Books are not enough. If you don't have Netflix, get it. As soon as you can, take a shower. Constipation can be a real problem (it was with me) so deal with it early. If you have an option for the nurses to visit you at home, take it, but do your best to go out for your blood work. Start your walking regime early, and do it like your health depends on it, as it does. My biggest suggestion is that when the hospital personal come to visit you to go over drugs and proper home care, make sure there is someone from home to be there when they do. There is a good chance that you wont remember very much.
Listen to your friends, listen to your family, listen to you doctor, listen to your cardiologist and listen to your surgeon. But most of all, listen to your body.