Finally, a topic I can help with!
Having spent alot of my childhood in Talland Bay (that's the beach area down from Tencreek)
It's my favorite place in the UK to visit.
Tendered has grown alot since I first stayed there 20+ years ago so can't comment on that too much other than its a 15min walk to the beach/rocks and a 45min walk back to the site as its extremely steep fields to walk back up.
As for things to do, Looe is really nice for a walk around and sandy beach, Polperro is a great old village and good fun in the evening with nice restaurants and pubs
Talland Bay itself is split into 2 parts, you have the 'beach' side wich is mainly shingle and the other side is very rocky with huge rock pools.
Great fishing from the rocks for mackerel and pollock.
Great crab fishing for kids on the river at Looe too.
There's lots to do but it depends what you like, we're all different!
So great memories of being down there,i must go back again soon!
Regards
Matt