1) The Itchen, in the UK: maybe the best wild trout water in the world, and possibly the most expensive.
2) Patagonia: big browns and seat trout galore.
3) Russia: in search of giant Atlantic Salmon
4) Gaspe Peninsula, Quebec, Canada: More giant salmon, and big brook trout.
5) a month to fish the Western USA, in search of rising trout. It takes me a week to really get in the groove, and a month to totally tune in.
I have lots more, but those are on top of the list!