Best ever stag weekend I went on:
Six of us on a long boat cruising the grand union canal dressed as pirates - with the stag dressed as ships wench.
How about you and your mate dressing as ladies to go for your walk up Scafel - very embarrasing for your stag (dressed normally) around everyone else bound to be up there.
If you can put on the Little Britain accents and idiosyncrasies for a day - bloody hilarious!
Have a good one!