The most recent "best days" were with The Black Isler and Firth of Forth around Leith and out in East Lothian in February 2008. It felt like a spring day rather than a winters one.
Prior to that, I had a manic day with Thunderbird30 dashing around Perthshire caches at a rate of knots. 23 in one day if I remember!
Thanks to FoF twice - once for the day and again for the coin!