Its all easy walking distance from the hotel above Walkabout, make sure you bring ear plugs if you are staying there as its right above loads of pubs and clubs so very noisy in the rooms, my one mate gave up at trying to sleep at 5am and went to the train station to get the first train home instead
Start off in the brewery quarter across the road from the hotel, loads of good bars and food places, and it all stretches out from there. Revolution is very good, which is opposite the castle, go in early say 8 ish and break up into small groups before and you should get in fine.
Have fun, we are used to big groups of Scots invading town when the Rugby is on.