Baltimore is best to visit during the spring and the fall. Summer brings great events and activities, but it is hot and humid from June to early September, so be prepared to hydrate and take air conditioning breaks. Visitors can take advantage of the free Charm City Circulator bus with four routes throughout the Inner Harbor, Mount Vernon, Fells Point, Federal Hill, and Penn Station. To explore other sections of the city like Hampden or Woodberry, consider renting a car or taking a taxi. The regional commuter train MARC puts DC within an hour's ride of Baltimore's Penn Station.