Should I go to a nearby castle with him?

Hi..My name is Prity and I am 16.There is this funny guy I met in college.He is sweet and always follows me everywer.But somtimes I doubt him..lyk wen i sit on his bike for a quick ride..he keeps on applying brakes unnecessarily..plus sometimes he also unintentionally stares at my boobs.Thing is..he wants me to go in a nearby castle with him..but he insisted I shouldnt tell my parents abt it..wat shall i do?? Shall I go?? what possibly can go wrong..Pls suggest quickly.