Spray your clothes with permethrine--pants, shirts, socks, hats--and let them dry. It kills the ticks as soon as they land on you.
Repellent is also a good idea, and tuck your pants into your socks. Don't screw around; Lyme disease isn't something you want to get. It's rampant in the Northeast, and is spreading.
Ticks in their nymph stage latch onto mice, so if you are at risk of ticks in your yard, fill some cardboard tubes with permethrine-laced cotton or dryer lint and toss them under bushes, woodpiles, etc. -- anywhere that mice might hang out. Mice will take the lint back to their holes and line their nests with it, and the permethrine will wipe out the baby ticks. Permethrine is said to be harmless to humans and other mammals, but still, be careful with it.