Can you wear contact lenses after PRK?

Moderate activity is fine. I would avoid swimming for 7-10 days to allow your corneal surface to heal and thus make infection less likely. 

In general most refractive surgeons will do both eyes the same day. This is perfectly safe and makes the recovery of visual function quicker. 

Be patient, it is not unusual to have an initial overcorrection with a high prescription.  It may regress over the next couple of months.  We generally wait 6-12 months before deciding on an enhancement to insure a stable prescription.