Dorneypark, Dutch Wonderland and Hersheypark are all about an hour away in opposite directions. Six Flags Great Adventure in NJ is almost two hours.
We used to go to Hershey seemingly every year for company picnics. My company goes to Dorney for picnic every year, haven't missed in 10 years, but will likey miss this year for Gramma's 80th birthday. We'll get there regardless, our Girl Scout council has an event planned in May.
Haven't been to dutch Wonderland in many years and probably was only there twice. Been to G.A. only twice, sat and waited on DH and friends for hours while they waited in lines for coasters the last time.