LAX
Assuming your coming in Air Canada (Terminal 2) You'll need to clear US Customs, I will be very suprized if you can check your bags through to Thailand from Saskatoon. Typically you will then schlep your luggage to the curb and get on the A Bus, taking it 1/8th to 1/4 of mile to Bradley to wait in line to get your baggage tags then stand on line to give them to TSA to check in. [I recenetlywalked an Aussie through getting your boarding pass from the red cap, even when you had no luggage to check to avoid the TSA lines - she was connecting off an internation to domestic, you are doing Int'l to International - Used to clear US Customs pre-flight in Vancouver but no offense it's Saskatoon - where are you leaving Canada ?]
Then you get in a shuttle bus to pick up your rental car, I would estimate up to 2 hours (maybee less) I do not know what they are recomending for International check in but let's say 2 hours, adding an additional 30 minutes to turn in the car and take the shuttle to Bradley, your eight hour layover now has 3.5 hours for sightseeing . With the exeption of the shopping center in El Segundo ("The second" for our friends from the great white north) all of the destinations reccomended are 30 - 45 minutes away levaing a true window of opportunity of 2 hours + the drive time to the destination
If your driving opt for GPS since you cannot afford the risk of a wrong turn