Open all year 10am to 4pm; no admission charge for the priory ruins or the well. The Penmon Cross stands inside St Seiriol's church, which still serves the parish and is opened by it, so the cross is seen when the church is open; Cadw refers visitors to the National Churches Trust for church visiting information, which was not found online. Cadw may close monuments at short notice in extreme weather.
Terrain level 1, accessible, for the priory and cross, with historic floors, narrow steps, high thresholds and low door frames in the ruins; level 2, easy, for the well, reached by a gravel path that can be muddy, through a narrow gate to a chamber with stone benches. Deep water at the fishpond and well. No toilets. Drones are not permitted.
Photo: The roofless refectory range of Penmon Priory beside Priory House and St Seiriol's Church with its pyramid-roofed tower, under a clear blue sky. Keith Ruffles, CC BY 3.0. Source: https://commons.wikimedia.org/wiki/File:Penmon_Priory_-_panoramio.jpg. Licence: https://creativecommons.org/licenses/by/3.0. Resized and cropped for display; derivatives retain the source licence.