The small wooden boats are quaint, sturdy, and have plastic flaps that can be pulled down if it is raining. The sun came out just enough to have an enjoyable hour on the water. Tour lasts about an hour and costs 18 euros. The staff was nice and friendly. The commentary provided was a recording in English - worked just fine for me, I learned some things about Riga. You spend most of the time in the canal, and then head out to the river to make a complete circle around.
We used the Hop-on Hop-off bus for the Riga sightseeing tour, which probably wasn't essential as most places are easily accessible on foot, but it was easy to navigate and great for anyone with limited mobility. The best part of this tour was the reduced ticket price of 50% for both the river cruise and the canal cruise.
The River Cruise is on a big boat with seating on the top deck, while the Canal Cruise is on a small boat, which was great and actually takes an hour to cruise the river and get to the top of the canal system, then go right through Riga, then back up the river - so you get the best of both worlds.
A good one hour trip with half the time on canal and being half hour on river Daugava. Seeing lots of interesting places. English audio comments has been offered.