Hopefully the wind won't be too bad so you guys can drift in that pontoon and drag a Carolina rig around some points or roadbeds. Boat positioning is the key and that can be a real challenge in a pontoon boat even on a calm day.
Don't know if you will have a trolling motor or not on that rig but if you don't you can use the outboard to position yourself up wind and throw out a C-rig and let the wind drift you across your structure. If you can find a big enough anchor to hold that thing, that might work too. Just be sure to use about 3 times as much rope as you think you will need to get a good angle or it won't stay put. The easiest thing will be to motor upwind and drift down. Just know that if there are multiple boats fishing the same piece of structure you are fishing and you keep firing up the outboard, you may get a few nasty looks.
There have been a Zillion fish caught off the old Hwy 514 roadbed on a C-rig. Some as big as 14 pounds in the past. It parallels the current Birch Creek bridge. Rig up a C-rig with a one ounce weight and a 3 foot leader and a 3/0 hook. Don't make the leader too long or you will be wrapping it around your partner's head (or something in that pontoon) every time you throw.
Fishing under the Birch Creek bridge can also be very productive especially during the middle of the day. A lot of times the bass school under the shadow of the bridge itself. Some of them are really nice fish too. Remember: The current State Record Bass was caught on a minnow by a guy crappie fishing on Fork.
You may want to get a few dozen and just sit under the bridge tied to a piling. Keep an eye out for the fish breaking the surface under the bridge. A live minnow fished about ten feet down will get you bit. All the bridges at Fork have a cross member about 10 feet below the surface that runs between the two supporting columns. The bass like to suspend around the cross members.
As far as the bait on the C-rig, you are only limited to your imagination. A few to try would be a Zoom Centipede or Baby Brush Hog, Trick Worm, Lake Fork Tackle Baby Ring Fry, or whatever else looks good to you. Use either watermelon red flake or green pumpkin colors. Those are the basics.
The main thing is to just have fun. Good luck and Happy Father's Day to all the dads out there.