I'm 7 months post op on my rotator and ACL reconstruction (2 weeks apart). I started back skiing late May. Most of June I would notice a little bit of soreness, but nothing alarming. The month of July felt really strong. Coming into August, I'm not even thinking about my shoulder or my knee.
I would enjoy free skiing, and go relatively easy until you get closer to 5½-6 month mark.
Glad to hear you're back on the water!