I would recommend NOT skiing your first day. You are from Florida, a state in which the highest elevation is 345 ft. The lowest point in Breckenridge is 9,600 ft. Keystone is 9,100 ft, and A-Basin is 10,000+ ft.
You are not ready for the altitude. Spending your first day relaxing, taking in fluids and carbo loading will go a long way to preventing problems with acclimatization to the elevation.
I am from Atlanta (1000 ft elevation). I took a trip out to Breck with 3 other people. We landed at 11AM and they hit the slopes at 6PM while I stayed back in the room. All 3 of them complained of slight headaches, minor chest tightness/pain and some nausea. I got depressed and felt sad (weird reaction), but had no other symptoms except for shortness of breath trying to walk up hills (happens to most folks) and waking up during the middle of the night more often than usual (also common).