The Speedwell Cavern trip involves taking 105 slippery steps (definitely no disabled access here) down to a bizarre underground waterway, getting on a rickety boat which then takes you down a flooded old lead mine, into an impressive natural cavern, while your guide tells you a little about the history of the mine. The round trip takes about 40 minutes.
If you have ever had claustrophobia, don't go- it's a very tight tunnel, you need to take care not to bang your head and there's no easy way out.
The guide we had was very friendly, and threw in a few jokes (although he acknowledged they were awful). He didn't bombard you with facts during the tour but you could ask him questions and he knew what he was talking about.
The cavern itself is a wonder of nature. It's not actually all that wide, but it is exceptionally tall. It's all reasonably lit- it's not as 'showy' as the National Show Caves of Wales, if you've ever been there (we don't make a habit of visiting caves particularly, honest). A worthwhile trip. read more