Carreg Cyfrwy

The walk up Carreg Cyfrwy starts innocuous enough - a modest path that gets properly steep as you climb. You're looking at maybe 45 minutes to the summit if you're not dawdling, longer if you're with kids. The real reward isn't the crag itself, which is just a rocky outcrop, but what you see from the top. On a clear day you get the Llyn Peninsula spread out below, the Irish Sea beyond, and on decent visibility you can pick out Snowdonia's peaks to the south.

History types will know this spot - it's got Iron Age fort remains up here, though honestly the archaeology is subtle if you're not looking. This is more about the walking than the ancient bits. Walkers wanting a proper workout will find it satisfying without being brutal. Families with younger legs might find the steep sections tedious, and there's not much to hold a kid's attention once you're up there unless they're genuinely keen on views.

It's completely free, obviously - it's a mountain. No facilities at the top, so bring water. Spring and autumn are your best bets weather-wise, though summer gets busy with hikers heading to the area's better-known peaks.

If you're based at one of the local glamping spots - Treheli Farm or Glampio Coed are both within five miles - this makes a solid half-day excursion. Not a destination in itself, but a proper good addition to a week exploring the Llyn Peninsula's walking routes.