rail passes can be expensive unless you are covering a lot of ground, most likely point to point is the cheapest, in Switzerland IIRC there are a number of private rail lines, so be carefull on that. Have used sncf many times thru Switzerland, but you also may want to look at milan, nice, lyon and up from there, tgv the whole way and you can stop along the way. The link from chrissxb will give you routes and times, also check www.ricksteves.com
for rail point to point maps that give you times and general costs for each of the legs. from milan, it takes 5 hrs to nice and 4 hours to Zurich, 6 to innsbruck. You can cover a lot of ground, hope this helps for the rail, as for the what to see and do, that depends on you, get a couple travel books and ck'em out.

good luck