If you're talking about the Tadoussac area, in the Sagaunay National Marine Sanctuary, then I'd strongly suggest a sea kayak, immersion gear, and rescue experience. That region really isn't a river, it's ocean paddling. There are areas of strong tidal overfalls, and when winds pick up, seas can get up along shore. There is also some serious shipping traffic in the Fjord, which can be dangerous to a kayaker.
July water temps are in the low 40s. That's very serious, and a capsize in that water temp is a very big problem if you aren't able to quickly rescue yourself, and if you aren't then dressed to avoid hypothermia. Definitely full wetsuit or drysuit conditions.
If you want to rent a kayak, you can do so right at the wonderful Paradis Marin campground, in Bergeronne (I think that's the right town - just east of Tadoussac). They have an associated outfitter, which rents boats, and also leads tours. Outfitters take safety seriously up there, however, and when we were there, anyone wishing to rent had to first demonstrate that they could do a self-rescue (in the 40-degree water!) If you're not up to all this, you could take a kayak tour, or even go out on the RIB tours that leave from any of the villages.
That said, it's an amazing place to visit and to kayak. You will see whales any time you sit by the ocean, and they will surround you in your kayak. We loved it up there. Belugas, Minkes, Fins, and even a Blue Whale were our constant companions. Gray seals and Harbor seals as well. Don't miss the small marine museums in Tadoussac and Les Escoumin, they are very well done - entertaining and educational.
Kayak Deck Gear Bags
Recreational Kayak Paddle
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