Is there a beach or area on Molokai that is particularly good for seeing and collecting seashells?

The west-end beaches offer chances to find the rare Kahelelani shells, which are very small and used for making highly prized leis. After a big north west swell, some other shells will also wash onto west-end beaches.

South shore beaches offer interesting shelling after a big swell occurs because the shells are stripped from the barrier reef by the big waves and washed ashore
The answer really is, luck will play a big part in your shell gathering success. However, on Molokai it’s not the number of shells you find, but the amount of joy acquired while searching.

Hope this helps.