In reply to Rob84:
Is sounds like you are after some "proper" mountain biking then after all and were underselling your skill level! Another time after warming up on Cooking on Gas and Blue Steel at Lady Canning, go over the moors and do Piper House Gate (it's a fantastic single track bridleway off Blacka Moor, slog back up either on the bridleways to the south (steep! but still gravel and smooth, or the roads, do Devils Elbow - the bridleway next to it - not quite as good I don't think as Piper House, then pick a route back over the moor to the start.
Doing Piper House Gate was the first place it occurred to me that the feeling of downhilling on a MTB is almost up there with descending off piste (actually 100 kms away from the nearest piste) when ski mountaineering! Ok, it's over quicker, but it's still pretty ace. It's also where I decided to splash out on a dropper seat post! But I've ridden it plenty of times on my bike which whilst having plus tyres doesn't have any suspension at all. If you've got a hard tail, you'll be fine.
It is mainly gravel road stuff south of Stoney Middleton and the main road up the dale, but there are some great trails around Eyam across the valley.