There is a small Morristown airport, but it services private jets only.
Car is a good bet and generally the parking isn't especially miserable though on-street parking is often metered. Navigating the green can be a bit of a headache at times and depending on where you want to go, but it's nothing to lose sleep over. A range of exits off of highway 287 allow quick and easy access to different parts of the city.
The Morristown train station is generally well serviced by NJ Transit, where one can commute between New York City Penn Station in about an hour. (http://www.njtransit.com/)
