Spa, steam, massage, swim safe 2 months after tummy tuck and breast reduction? YES, but . . .
Assuming you have healed uneventfully, all your skin incisions and the muscle repairs have healed adequately and strongly. Scar tissue is not yet mature, softened, and faded maximally--that will take 6-12 months. As long as your scars are pink, they should NOT be exposed to ultraviolet of any type (sun or tanning bed) or else your scars can turn dark and will remain permanently so.
Also, your sensation has not returned completely, so you do NOT have the normal protective response to...