@ginabassford, I had a full on Starbucks from the lobby of my hotel the morning after my discharge from St. Mary's.
I was not given instructions regarding no caffeine, so perhaps this is a question to ask your care team?
I also had wine with my dinner the night of my discharge. I felt like I earned it!
I did not need a walker or any devices to get around, again we are all different, with different co-conditions so post op instructions may differ patient to patient.
No driving for a month is a hard rule I believe, as the sternum needs time to heal, just like a fracture would. I was almost afraid the first week to even be in the car...what if there were an accident and the airbag went off? But I worried for naught!
There are many helpful suggestions here on Connect that are useful for those getting ready to go through open heart surgery...each one of us who has gone through it has their own unique take on the process...take for instance a lounge bra. I was thrilled to have mine, and others didn't even wear one! See? We are all different.

As Debra, @karukgirl pointed out, we are so, so different! It makes for interesting reading. While she had no restrictions on caffeine and alcohol, I was told that caffeine stimulated my heart, and I was to give it time to heal. I think it was for 6 weeks. I love my coffee dark and strong! Do ask! Alcohol - no stated restrictions, I enjoyed my light beer or wine as I always have - I am sometimes (yes, I go from one side of the "line" to the other regularly), prediabetic and need to be mindful of carbs and regular beer is loaded. As to the walker and bra - we are all different, indeed! We drove home and stopped every 90 minutes - two hours at rest areas. I know I would have been absolutely fine without the walker, but at Mayo they insisted that I have one, I did use it just because I had it! My husband was more willing to let me walk around solo and use the facilities in private because he was afraid that I would fall. As you can see, these details are so individual and when the time comes, your unique needs will be discovered.