+1 for Rivington and Belmont. Some good hills up there to get your blood pumping.
I also go over Ramsbottom/Edenfield/Norden/Rochdale way sometimes. I do find myself getting bored at times as most of my rides do end up over Rivington, but I want to start throwing the bike on the car and going somewhere different.
A couple of colleagues of mine have started to meet just outside Chorley on a Sunday morning, (8am). If you wanted to meet up with them and venture out just let me know. I've not been with them yet but I know they've been doing about 15 miles, but if I rode from home to meet them and rode back it'd be about 30 miles for me which would suit me better, but they are supposed to be building upto 30 miles themselves anyway.
I'm doing the Cat & Fiddle challenge this coming Sunday in Stoke. If you fancy that the details are
HERE