Here is a BIG bit of advice, and it will sound crazy to some.

Go visit some colleges, maybe not the school you or your son is dying to play lacrosse at, but a variety of schools. Large, small, rural, urban, older newer, maybe a service academy. Talk to some players Your son might get an offer out of the blue and will want to move somewhat quickly. Getting your son to be familiar with the concept of a good academic and social fit is important. It really isn't all about lacrosse.