Here is a link to information on the park
http://www.saskparks.net/MeadowLake
Fishing Information
http://www.environment.gov.sk.ca/fishing/
Apply for a HAL online and purchase your fishing license there. Print off a few copies and keep one in your tackle box, boat and vehicle.
I know of one fisherman who fishes for walleye on Kimball. Goes early in the morning before the skiers are out and normally gets his limit he says.
Waterhen can produce some nice sized pike. My neighbour was out last month ice fishing on the lake. They caught one only fish and it was a 17 lb pike. Fishing in the park this winter was fairly slow so hopefully more fish to catch this summer.
Waterhen and Lac Des Isle can get quite rough when the winds blow. Lots of smaller lakes to fish when it gets windy. Every year, big pike get caught in Lac Des Isle also. The biggest I have caught there was 14 lbs. Sister in law caught a 20 lb 3 years ago. Pierce lake and Cold Lake have Lake trout.