Acutally Harrisburg is about 15 miles north of Three Mile Island. The distiction of having that power plant belongs to a smaller town called Middletown. Around Harrisburg there isn't much to do in the way of entertainment. Although you could go to Hershey Park that's a 30 min drive away. There is a science and arts center and a few nightclubs. The city is also home to the Senators, a baseball team that plays on City Island. Most people head over to the west shore for more fun, although all of central Pennsylvania is boring.