Tre'r Ceiri

The walk up Tre'r Ceiri rewards you with one of the finest hilltop views in Gwynedd - and the added bonus of wandering through the ruins of an actual Iron Age fort. The name means 'town of the giants' in Welsh, which feels about right when you're picking your way through the stone circles and defensive walls that cling to the summit at 564 metres. It's not a brutal climb from the car park near Pwllheli, but it's proper steep in sections and the final push onto the ridge tests your legs. Allow two hours return for a leisurely pace with time to catch your breath and take in the geology.

Historically minded visitors will find this compelling - the concentric stone ramparts are genuinely impressive and clearly defined, and archaeologists reckon around 200 people once lived up here. On a clear day you're looking out across Cardigan Bay towards Snowdonia. On a grey one, it's still atmospheric, just shorter on views.

For families with younger kids, this one's a mixed bag. The terrain is rocky and uneven, and there's proper exposure on the ridge itself - not dangerous but definitely not a pushover for toddlers. Walkers and history enthusiasts will get real value. It's free to visit and there's no fixed time limit, though weather in North Wales can turn quickly.

If you're staying at one of the local sites - Gyrn Ddu Campsite or Away From It All glamping are closest at just over 2 miles - this works as a proper full morning out. Absolutely worth fitting in around a Gwynedd holiday.