Can't be arsed reading through half the obvious crap! My Sister lives in St Ives and I spend a fair bit of time in the area.
Firstly the food is fantastic - fresh caught seafood, Cornish Pasties etc etc...as long as you go the right place.
Got a couple of good boozers and a fantastic Manchester City dedicated Male hairdresser's place behind a toy store.
Lands End is shit. You'll see a shipwreck, a farm with a few sheep and a helicopter used by the coastguard years ago. - avoid.
Penzance has the best chip shop ever! - battered sauasge, chips cooked in beef dripping, fish cakes, fresh cod etc - lovely. No gravy or curry but the flavour makes up for it.
Tea & scones offered near the beach at St Ives - a delight
Enjoy mate. It's a wonderful part of the country.