Relax, you'll do fine!
I haven't ridden the CAM routes before, but they say the longer the ride, the hillier. So you should be ok with the 30ish mile rides. After all, you have all day to do them! There will be hills, but if you've been riding your hybrid, you should do fine.
As far as other people always being in sight, I don't recall that there were always people around last year, but as long as you leave fairly early in the morning you're likely to see quite a few people. You won't be riding in a crowd, though, as people leave whenever they're ready after breakfast.
The routes are well marked and they provide cue sheets, so I don't think that will be a problem.
It would be fun to meet you. Zencentury and I will be there.