ok.. have some more details now..
am arriving on friday morning, leaving sun night.. so about 3 whole days with us.. ofcourse the standard berlin tour will be done.. we will be there on 1st may weekend so is there anything else (apart from berlin) we can do in those 3 days ?

I went thru some of the links in FT for this, but more info is appreciated on side trips possible on a 3 day trip to berlin..