How far away from your canoe would those potential campsites be?
If in the ~100 meter (~110 yards, ~320 feet) range, then the TK20 would be perfect, probably a little further away as well (I'm guessing around 150 m). But if that's not at all usefull - then I think you're bordering HID territory.
I've never tested the top range LED "look far away" lights like tiablo A9, A10, deerelight or the sunlite eagle 16w (though I'd really like to have one of the 16Ws). You may want to ask the forum about how far their useful range would be for your application. They may or may not cut it for your application. But even the weakest, cheapest HID will blow any high end LED lights out of the water.
It's up to you to decide if the drawbacks of HIDs (either large, heavy or ridicuolus high prices, or all of the three - and not waterproof unless you pay even higher prices!) are OK for your rather limited application (camp site spotting) that you really don't do that often.