It's too bad you're not on southern Vancouver Island right now, Paul! I went back a couple days later and the Solitary was in a tiny side puddle and was even more cooperative - down to maybe a few metres. It was rather confiding but the lighting wasn't nearly as nice.
Solitary Sandpipers will end up out on mudflats like Boundary Bay occasionally, but I see them more on flooded agricultural fields or small ponds with a muddy fringe more often. They must end up in the Iona ponds periodically, no?