OK, I've got these free train tickets, as you know, and was thinking of going to Peterborough to visit the cathedral (I would have done the museum too but it's closed ). How ever I also notice there is a historical walking tour which sounds interesting that I'd like to do as well. The problem is the tour is only on Saturdays, but as far as I can tell the Cathedral has events taking place on every Saturday until Xmas, and my tickets expire at the end of the year! Is it worth trying to squeeze the tour in, should I just make do the the cathedral? I could always go twice I guess, since I have the free tickets....