Best stain for a cedar tree house deck (shaded)

Hello,

I'm looking for a good water based stain for a cedar tree house deck and railing. There will be almost no sun exposure and I would like a clear stain that just shows off the natural colour of the wood (western red cedar). Traffic will be pretty light as compared to most decks and with no sun this should be easy but I would still like to pick a quality product and I do want to use a water based product for cleanup, environmental and health reasons. I have all the cedar, it's been in a lumber yard stacked and covered for a few years at least so it's not exactly new but I'm not sure if you would call it weathered. I would like to cut everything to size and then stain and install it if possible as it will be difficult to do a clean job in the tree with falling needles and bark and such! I can let it weather if needed though.

Any recommendations? Available in Canada is another requirement.

Thanks,