too late for the november trip but... in case it helps anyone else...
i'm a little biased, but i also highly recomend the MIT campus; it has lots of contemporary stuff as mentioned above. in addition to the aalto and saarinan and gehry, there are recent new buildings by roche dinkeloo and stephen holl (though i've yet to meet a fan of the holl building). the rest of campus is dotted with gems, a couple of i m pei buildings, and a charles correa project (under construction) . there are regular tours of the mit campus, and architecture oriented walking tours every month or so.
if you have a car you could visit the gropius house in lexington; it is now a museum and will be in the guide books. next door marcel breur's own house, and another one or two breur designs, wont be in the guide book; while they are privately owned you can see them from the road.
a new bridge, the leonard zakim bunker hill bridge, is fantastic, designed by christian menn. its on I-93, and is difficult to miss; you can see it from anywhere in boston or cambridge.
also check out the sanders theatre at harvard.