Hard to answer as Plastics is so broad. My friends in private practice who are "generalists" do a fair bit of breast surgery (augs, reductions, implant recon), skin cancer excision/reconstruction (especially if they're friendly with the local MOHS guy), some basic hand (carpal tunnels, ganglion cysts, triggers), and a wide range of cosmetic (depending upon what you like to do, facelifts, noses, body contouring). Most general guys out in private practice don't really do facial trauma (fractures) and most try to avoid hand call.
It really depends upon two things:
1. What you like to do.
2. What the community needs.