Nantlle Ridge is an excellent day out bagging two 6 point summits GW/NW-024 Trum y Ddysgl and GW/NW-020 Craig Cwm Silyn. One of my favorite day activation’s.
Being restricted to time with a bit of height I would suggest GW/NW-022 Moel Eilio is a lovely summit. If you don’t want to travel too far from Pwllheli then GW/NW-075 Yr Eifl is easy to climb and has a great take off.
NW-066 is a nice walk. Stony top with a good shelter having done it fairly recently.
I agree with Jonathan about the Nantlle Ridge. I’ve done that with my MTR. It’s a great hike.
But if you get good weather for a lovely day out with the family I’d suggest Bardsey Island. Please see this thread.
I have a page on my blog that covers most of Pen Llŷn as well as the one on Bardsey.
One I’d recommend for a gentle day with the family, especially if the weather is good, would be to do Garn Boduan in the morning, and then head to the beach at Morfa Nefyn, with lunch at Tŷ Coch, further along the beach. It’s a sheltered bay and can be quite scorchio (for Wales) in the summer, and thoroughly pleasant in springtime.
Of course if you want a train ride I am bound to recommend the Welsh Highland Railway from Caernarfon to Porthmadog! Whilst it doesn’t take you directly to a SOTA about half-a-dozen are along the way. You might take it as a route planning exercise whilst enjoying a beer.
My XYL said she wanted to take the kids swimming this morning at the holiday park’s pool. I’m not a fan of swimming, I haven’t been in a pool since I visited Florida in 2002! So, unexpectedly, I had some free time this morning.
I decided to try to squeeze in a quick activation of Carn Fadryn GW/NW-058. The drive to the former chapel at Garn Fadryn took about 25 minutes, and, without stopping to admire the lovely view, it took me 21 minutes to reach the trig point.
Again I used the MTR 2 bander and 30m/20m dipole on 4m pole. Although my phone was showing full bars of signal, I couldn’t get data to work, so although I tried many times, I couldn’t spot myself. It had been such a rush decision to do some SOTA that I hadn’t set an alert. Business was slow but eventually I worked a French station who seemed to be looking for a general QSO. It was fantastic to have two S2S contacts into HB9. After 5 QSO’s the callers dried up and even a change to 20m (still no spot) produced no further QSOs. At one point, I had extreme QRM from two Hawk jets that circled the summit three times at about 1000ft, one pass was obviously a ‘flying lap’
I was back at the holiday caravan for 1230 local to have some lunch with the family and hear about their swimming.