have just found that me and dh can get whole week off together in summer hols, so have cancelled our short break to brighton and booked a week in edinburgh,self catering.We will have ds 17, dd 6 and ds 4, .what are the must sees, and how easy would it be for us to see a little more of scotland, maybe beach/ mountains etc. We are travelling by train. we have never been to scotland so want to cram in as much as possible.