Go karting is awesome at daytona..
Chill Factor snow boarding is good fun.. water sports at Salford Quays WS Club.
Google Manchester guided walks, hidden tunnels, awesome, random but really bizzare and good fun.. even with the lads, town hall tour etc...
I live in Manc, in the city centre, its a nightmare getting in with lads.. walkabout is group friendly. Book in advance a quick e-mail to the manager of a bar/pub will help.. The Northern (again book in advance) stays open till 5am.
Bem Brazil (Meat Feast), Topkapi palace, good turkish grub (posh kebabs) for a group of lads..
Akbars, awesome curry, google it.. its huge and packed with good vibe every night..
Google Rum Trails/Walk manc also.
p.s Pub all day is never a bad plan b