Memorial Day weekend starts today and it also marks the official kick-off of summer! Millions of Americans will be celebrating the four-day holiday this year in a many different ways. Memorial Day is traditionally one of the busiest travel holidays of the year and this year is no exception. A record number of 37.5 million Americans are expected to travel this weekend by land, air and sea, up over 4.7% from last year. Popular destinations from South Beach to Manhattan, Las Vegas to Washington DC will filled to capacity this weekend with vacationers taking advantage of the extended holiday weekend..…