We guess that you'll already know your local area quite well, but if you've recently moved or you want to cycle elsewhere, there are map websites to help.
Our favourite is Cycle Streets  which covers all of the UK. We particularly like that:
Both Guildford Borough Council  and Surrey County Council  have maps specifically for cyclists. And tourist information offices are likely to have paper copies of these and similar maps - don't forget to pretend you're a visitor to the area ;-)