Sailing I know in THEORY, but not in practice (I've never had the chance) but I have sailed model sailboats. She can teach me

As for sharpening knives, THAT I know. I still remember one very good frend asking me to borrow a knife, as I handed it to him (type of friend that if he wants my knife, my car, my truck - anything, he can have it), my other friend who was with us (of the same caliber) looks at him and says "John, be carefule with that, if Charlie says the knife is SHARP, it's REALLY sharp" (hint, if I can't shave efortlessly with it, it's anywhere from "it's slightly sharp" (if it'll still shave) to "dull"