If you did get poison ivy, I have found something that works great for me... orders of magnitude better than just calamine lotion. Try Tecnu Extreme... I find it usually on the same shelf as the pink calamine stuff at the drug store, or even sometimes in the pharmacy section of a grocery store. I scrub the area as soon as I feel a hint of itchy, and it has worked wonders for me. Of course the best is to learn to recognize the leaves/vines and stay away...
Nice find on the tree, and good luck on turning it into some bows!