For a great vacation, why not think of staying at a Cambridge B&B in eastern Massachusetts? Travel to the city during October and experience the annual Head of the Charles Regatta. Another option is visiting during January for the yearly Gospel Concert honoring Martin Luther King, Jr. But for history buffs, anytime is perfect for experiencing what Boston has to offer. There’s the Harvard Museum of Natural History, the notable Brattle Street with its Tory mansions, as well as the celebrated Longfellow House. When you book a stay at a Cambridge bed and breakfast or Cambridge inn, be sure to check out the Bluefin Japanese Restaurant for their healthy cuisine. You can also dine at 16th Garden Street, which is popular for New England-style cooking. Less