My interest lies with WW II more too, but having seen this museum and the trenches (read: what's left of it) made my interest in WW I grow a lot.
Yes, the fieldtrip was good, thanks. Maybe you should walk around your own city
and find out what happened that day in Sarajevo and why it was the trigger of the war. It was not the cause, mind you, there were several causes which ran deeper and had been there for a few years: nationalism, alliances, militarism, etc.
I know way more about WW II, but since there is little new for me in that war, I'm into WW I now. It is gonna be my second favourite historical subject, I think.