Welcome to the VR community. Glad you found us.
After discharge, I was instructed to see my family doctor within the first week, who was responsible for monitoring the overall healing process and my INR (while on Coumadin). I was to see my Cardiologist 4 weeks after surgery and the Cardiac Surgeon 6-8 weeks after surgery. They said I could probably drive 6-8 weeks post-op and drink alcoholic beverages in moderation once off of the narcotic pain medications. I was allowed to eat pretty much anything I wanted, but naturally they recommended a heart healthy diet. However, the first couple of months, things just didn't taste right and I didn't have my normal appetite so I didn't eat or drink (I'm a beer and wine lover) very much during that period. I'm back to my old self now. I was also told I could travel if necessary soon after surgery, but to take it easy. That said, I don't think it is a question as to whether you are allowed to travel verses coping with the discomfort of travel. For a few months after surgery, I found it very uncomfortable to be in a car for any length of time...whether as a driver or a passanger. I assume I would have been just as uncomfortable sitting on an airplane or train.
Everyone's recovery is different so just pace yourself and listen to your body and you'll do fine.
Best wishes and good luck.