Speedwell Cavern - £40
Peak Cavern's/Devil's @rse - £37
Combined Speedwell/Peak family ticket - £61.00
Blue John Cavern in Castleton - £32
Treak Cliff Cavern in Castleton - £27.50
There's also Poole's Cavern @ £27 a little further south.
The question is, which ones are really worth the visit? We have a couple of boys (11/12) who might like the idea of an underwater boat and a rude name to a cave entrance, but some of the review suggest those two caves are someone unspectacular one trick ponies! I'm sure I've been down the Blue John Cavern as a kid, but don't remember it as I went down loads of caves looking for Blue John way back when! Treak Cliff sounds more interesting in some ways (and perhaps undeserving a bit less popular than those around it).
What is the best use of our time? We can only afford to give a single morning or afternoon to getting to an exploring a cave(s?), so no multi-day adventures..