I've lived in San Jose nearly all my life and honestly, there isn't that much interesting to do. Some amusement parks you could visit are Raging Waters and Great America (i think it reopens next year in March). Other places you could go are the Tech museum in downtown San Jose, the Art Museum in downtown San Jose, and HP Pavilion for concerts/Sharks games. Oh, and winchester mystery house is pretty cool to visit once.
Man I can't wait for finals to be over so I can go home QQ