No route map. loads of route choices. There's an old route description knocking around on the web that helps.
The main options are on the best way to Elidir Fawr (gully or summit routes - summit for me), the best descent off Glyder Fawr (red spots, glaciated slab or earlier - earlier for me), and the best way up Snowdon from the Bwlch (watkins or east ridge - east ridge for me).
Brilliant race, did 3:38 last year, but if it's a hot day I'll be happy sub 4.