This is the church that's famous for being "St Mary's church in the pool of the white hazels".
The church is down a narrow lane to a point overlooking the Menai Strait. It's a very nice church despite the silly name, and I was able to go inside and have a look around and check out the font (it has a rather uncomfortable pointy-topped font cover).
There is a statue of Lord Nelson at the shore here. I didn't bother visiting him though.