I'm guessing that your father will be staying at the Fort. Two ways to fish the Bay lake.
1. They offer Guided Fishing Excursions. This is kinda costly $$,,but is LOTS of fun,,you can take up to 5 people per boat, it's a 2 hour trip, you will catch some real nice fish. Several years ago my wife caught a 9 pounder on a guided trip. Disney provides all the equip., bait, etc., you just show up.
If ONLY your father wants to take this guided excursion alone, at 1:30 pm (because its hottest part of the day) he can take this trip for a lot less $.
All the guides are very good. We like the guide named Uby ( Ooo-bee ) .
2. If he is wanting to fish Bay lake on his own, he should expect to (maybe) get his feet wet. He needs to bring some dark plastics, some divers like jitterbugs, and try rattle traps. Personally, I really like live baits, crawlers and shinners, but unless you are staying at the Fort keep'n the shinners alive can be a problem.
Best fishing,,I would go to the canal at loop 300, start at the lake and fish your way back toward the marina.There is lots of water grass, you'll have to deal with this. (wade)
DO NOT fish near the docks or on the docks!
Then, fish your way from the Fort toward the Wilderness Lodge.
Remember, Disney fishing is catch and release only.
You may want to keep a camera handy.
Happy fishing to your father !