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HULL — The first thing you should know is that you can get to Nantasket Beach by commuter rail only on weekdays. Whether this is good or bad news depends entirely on your attitude toward playing hooky on any given Monday through Friday. The long, gray sand beach “gets sardine-packed on the weekends,” one of the lifeguards told us, but there is more room to spread out during the week. The shoals beach near the mouth of Boston Harbor is especially broad at low tide, but tends to nearly disappear at high tide, so check the tide charts at www.tides.info (search for Nantasket Beach, Weir River, MA) before you plan your getaway.