Here on the plants page you learn about the plants you might encounter on those trails and which one to avoid!
Out in the woods there can be poison ivy. To deal with poison ivy wash off with soap and water to get the oil off. And a good way to remember is the saying "Leaves of three, let it be"
Wear long sleeve shirts and tuck your socks in including wearing long pants. Make sure to wash yourself after hiking in a forest with poison ivy