The Blue Spring, Waikato Said smugly, I’ve been raving on about The Blue Spring in the Waikato for months now. Not like these Johny-Come-Blue-Spring-Latelys at Stuff.co.nz who’ve today asked the question: “Is it NZ’s best kept secret?” Months! Four to be exact. But still, months! Truth be told, like most Kiwis I’d never heard of…