I'm asthmatic and seem to manage a case of pneumonia about every 3-5 years. It can be very ugly. As a result I was pretty rabid about getting the H1N1 and seasonal flu shots this past year. Last time I got the flu I ended up with pneumonia and was pretty much out-of-commission for 2-3 weeks, with at least another week before my lungs started to feel anywhere near back to healthy.

My best advice...don't overdo it on the cardio. It won't help you recovery and could actually cause more lung strain. Maybe now is a good time to consider some strength training.

Swimming might be OK, as some people's lungs do well in that humid environment. I'm not one of them, as I find the chlorine fumes set things off.