Start with a drift down a river like the Allouette (lower). The drift from Neaves road to Harris road would take an hour or two depending on the tide and whether you stop to fish. There isn't a single hazard I can think of on that stretch. Not much more challenging than a lake, but will give you a taste of flowing water. Always take care, even on that type of water. I have had to rescue someone on the Moyie River, a river so placid, if the wind blows slightly upstream, you have to row to go down stream. Even so they were able to get hung up in a sweeper that came 3/4 of the way across the river.