I don't think I'd buy Eurail pass, as they are not advantageou$ for 1-2 point to point trips. Better to look at individual train ops, like German, French rails, etc upon arrival, then book online. You may find airfares on their many LCCs more suitable for price. Also, some cities offer great bus service. The best advantage for any train is that you can find overnights.
Be prepared to spend several days trying to get back to the States. Try oddball options, like WOW Iceland and then DL from KEF to JFK (even tho that will likely be VERY heavily loaded)
I'm with Mig--cut back that luggage--nobody really cares how dressed up you are on a cruise--you have to sacrifice something to nonrev somethimes--ladies--6 prs of heels/matching handbags, hosiery, jewelry, makeup, toiletries, etc--all absurd! Guys--cut back all the jeans (too hot) a few pr light trou and some nice shorts--not cargo crap with heavy hiking shoes. Pretend the airline lost all your luggage and go with the flow! You can do it!! Think LIGHT....