I thought you might have an issue with a pleasure boat operator's card (necessary for all boat use) but it looks like you are ok:
Q. What if I don’t live in Canada, but boat there?
A. Non-residents only need to obtain a Pleasure Craft Operator Card if they are operating their powered boat in Canadian waters for more than 45 consecutive days or if the boat they are operating is registered or licensed in Canada (this includes rented boats).
"Powered boats" include those powered by electric motors.
There is a ton of rules regarding safety equipment (life jacket, bailing can, whistle, etc) that you should take a look at.
Stump is a pretty big lake (north of Merritt) - never fished it but you might have some issues in a small boat.
Kawkawa is near Hope.
You will want to fish a fairly low elevation lake as many higher elevation lakes in the Merritt - Kamloops corridor will still have ice in early May.