We always have the whole week off after the Monday of Presidents Day. We also have a week in April - the Monday of Patriots Day (commemorating the Lexington/Concord "Shot heard 'round the world" which is only observed in MA and RI) and the following week. That Monday is always the running of the Boston Marathon and usually falls some time between the 15th and the 19th of April. All public schools in the state follow this calendar, and private schools make their own decisions.
The vacation has nothing to do with Easter, which makes me very happy. I don't think weeklong vacations necessarily should line up with a holiday of a particular religion. Our schools do close of some holidays due to the problem of insufficient staffing - these include Good Friday, Rosh Hashanah and Yom Kippur. Individual students are excused with a parent's note for religious holidays including Eid, Passover, and any other major holidays. It's considered an excused absence.