The Brecon Beacons is a very popular national park that attracts thousands of visitors but it is still easy to find quiet secluded spots where you can get naked if you know where to go. There are delightfull streams in bits of wooded areas that you come across that you can sunnbathe naked next to. Sometimes it is useful to take a pair of secateurs and you can cut through brambles and bracken to find delightful spots that haven't seen any human footprints for months and years in some cases.
Deerhurst to Great Malvern on the west side of the ridge is the best for naked walking. There is plenty of cover and some wonderful ponds for wild swimming. Walk it once dressed and then try it naked having remembered where the holiday cottages are. But I love this walk even when I'm clothed.
Grand time had in the last week out in the Brecon Beacons, had some nude time pretty much everyday.
The walk up to Llyn y Fan Fach a couple of times actually, nude most of the way up and nearly all the way down, and explored around the lake a wee bit too. Only a handful of people met, and just about managed to keep a comfortable distance from what looked like a DofE group. Delightful spot, not too much of a hill, and very atmospheric at the top when the clouds rolled in. Although heavily grazed by sheep, some wildlife was still present, a lovely colony of house martin half-way up.
Although we did walk up Pen y Fan, it was too busy to really do it nude for any distance at all, however I did skinny-dip in the llyn which offers a really enjoyable swim. The beach under the summit side is best for getting into the water. Seems likely there will always be people pausing to eat there, but there's enough space to take a dip without upsetting anyone and I think my theory holds that textiles care less if they can see you just want to swim.
On arriving a red kite did the most glorious circuit of the cwm.
There were other adventures, but that's for another time.