Saturday & Monday see the biggest swell forecasts for some time. Saturday's swing is particularly powerful due to the long period, but Monday's coincides with a particularly big Spring tide.
From Windguru (Well, Magic Seaweed is no more, and this at least give some detail - though it's aimed at windsurfers primarily)
On the north coast at Sennen, significant swell height (biggest swell will be around 50% bigger) exceeds 5m on both Saturday & Monday.
On the south coast, Monday is the time to watch. The swell forecast is a good deal bigger than on Saturday, the wind is onshore, and it all coincides with the big spring tide.
Praa Sands in Mount's Bay
Something to watch, especially if you live in Looe. Photo opportunity at Porthleven.
Graham
Penzance