Lleyn Peninsula Itinerary:

Many possibilities here; sites I feel are a must are in capitals; others in lower case. The route is roughly anti clockwise, entering the Peninsula from the Porthmadog direction.

CIST CERRIG Portal Dolmen, cup marks on rock nearby SH 543 384
Burial Chamber - Ystum cegid ganol SH 498 413
http://www.themodernantiquarian.com/site/143
Burial Chamber - Rhoslan SH 484 409
Standing Stone - Rhosgyll SH 465 406
Standing Stone - Y Ffar SH 400 390
Burial Chamber - Y Ffar SH 399 385
Standing Stones - Moelypenmaen SH 345 390
Standing Stone - Wyddgrug SH 293 365
Burial Chamber - Mynydd Cilan SH 301 235
TAN Y MURIAU Portal Dolmen & Long Cairn SH 238 288
MYNYDD RHIW Mesolithic & Neolithic Axe Factory SH 234 299
Standing Stone - Rhiw SH 226 278
Standing Stone -Llangwnnadl SH 326 209
MYNYDD CEFNAMLWCH Dolmen SH 229 345
Standing Stone - Moel Gwynus SH 346 421
Standing Stone - Lwyndryrys SH 379 417
Standing Stone - Pencaenewydd SH 402 402
BACHWEN Dolmen with 110 + cup marks SH 407 495
http://www.themodernantiquarian.com/site/132
Burial Chamber - Aberdesach SH 430 511
http://www.themodernantiquarian.com/site/2142
Standing Stone - Coed Hywel SH 445 542
http://www.themodernantiquarian.com/site/2143
Standing Stone - Pen y Bythod SH 442 554