The crew: four Nottingham University undergraduates who had just finished their exams and were looking for the bright lights!! Having spent the first night at the Liverpool Arms, Menai, they were equally impressed with the pub at Porth Dinllaen, so much so that nobody could remember its name.

A three day cruise Conwy to Porth Dinllaen on Enigma - by Keith Belfield

Porth Dinllaen, a picturesque bay on the Lleywn Peninsular and well worth a visit.
A popular anchorage sheltered from most except the NW - E
A place where you can get away from the madding crowds, but most importantly, there is  a pub which affords a very warm welcome to visiting yachtspeople. Settled conditions are desirable as there are tidal gates and difficult passages in strong winds to consider when returning to Conwy. Caernarfon Bar should be avoided in strong winds, particularly with wind against tide.

From Conwy to Porth Dinllaen aim for the Swellies at HW slack then continue to Caernarfon Bar - (2 hrs approx from the Swellies). 
      We moored overnight at Menai Bridge, lying against the Prince Madog and spent the evening in the Liverpool Arms before continuing on with the morning tide. Passaging the Swellies at HW slack allowed us to reach the Bar for the start of the ebb with plenty of water. We continued on down the coast, with the beautiful backdrop of Snowdonia. It took 2 hours approx from Caernarfon Bar to Porth Dinllaen.

There is good holding on a sandy bottom. Our yacht draws 1.5m, anchoring in 5m of water was sufficient depth  without putting us too far away from the pub.

Tide heights at Porth Dinllaen
MHWS - 4.6m
MLWS - 0.5m
Range   - 4.1m

From Porth Dinllaen to Conwy
We raised anchor 6 hours before HW Liverpool (approx 2 hours after LW Porth Dinllaen)
Arrived at Caernarfon Bar 2 hours before HW Caernarfon
Arrived at the Swellies 2 hours before HW Liverpool
Having passaged the Swellies it was one hop to Conwy arriving back at the Marina for the start of the ebb with plenty of water left in the Channel.