Infection risk is probably one in several thousand for individuals who are risk averse and cautious - clean hands, rest as directed right after their procedure, avoid hot tubs and swimming pools for several weeks, use only eye drops given as directed for 5 days. I believe beam quality varies widely with different laser systems. The verdict is not in on other lasers being investigated, but the Visx Star S2 is a phenomenally engineered product. First week, light jogging, stationary biking or aerobics after 48 hours. Stay indoors the first day.
Golf is ok with eye protection after the second week.
Lifting weights, wait about three weeks, then half maximum strength. Truly vigorous, competitive contact sports might wait even longer. Swimming, hot tubbing - avoid for three weeks. In fact the first four weeks at least some type of eye protection is advised to protect from freak injury. Most people use wrap around protective sunglasses glasses, safety glasses from their local hardware store, or replacement lenses for their glasses with 0 prescription.