Why shoot the spots in high def if the cable channel is only playing them in standard def? Ask the cable company for the delivery format they take.
Local spot, I’d shoot it in beta, second choice DVC-Pro or DV-CAM.
You might be surprised how much grip gear it takes to shoot something “natural-looking” outdoors. Overhead butterflies, scrims, reflectors are what you’d use the most, though an HMI or two may come into play. You’ll need hefty power for those, but these spots look like they don’t have any on-camera sounds or dialog delivery that can’t be looped or foleyed in post, so generator noise is not going to be a factor.
Plan to bring along polarizing filters for working near the water. A set of grads and a matte box would be apropriate.
Underwater photog may be overkill for a local spot unless you find a local dive nut that will handle this part just for fun. An old trick to get on-the-waterline or just-below-the-waterline shots on the cheap is to put the camera inside a dry, empty, leak-tested aquarium, then float/hold the aquarium in the water and adjust in depth and angle so the lens is on the level you want. Lens must be right up against the aquarium glass wall or you’ll get reflection trouble. Of course, any little mistake and you’ve dunked the camera, so be careful!
The hardest gag on your list is the guy getting drenched by the waterskier. This could be dangerous if you are trying to shoot from the water side and have the skier and boat come between you and the shore. You’d need real pro boat drivers and skiers/stuntpeople for that. If the terrain was such that you could hang the camera on a jib higher than the skier or boat could hit, that might work. Or you put a stepladder out in the water to make a stable platform, place the camera on it, lock down a telephoto shot and back away until the skier goes thru, maybe, but that’s still a big hazard to the boat and skier. Slightly less dangerous would be to replace the skier with a person driving a jetski, as we remove the tow boat and rope from the equation. You still can get the big on-shore wake splash of the golfer you were looking for, maybe better than a waterskier could do, and it can be done at lower overall speed, which reads better on camera and is safer.
Shooting that from the land side certainly can work and that would be somewhat safer all around, and cheaper and safer to the camera. A raincoat for the camera would probably be enough unless you’re shooting too close.
The first “corona style” shoot should be knocked out in an hour. Set it up earlier in the day then shoot it at magic hour before dusk. Figure a half-day for that shoot altogether.
The pontoon one? Didn’t give me enough detail to make a good guess, a loose guess would be a half-day.
The golfersplash needs most of a day, if you’re going to try multiple takes, plan for extra sets of dry clothes or a way to clean/dry on site. Plus away to re-groom the area of the shot after each pass. You will need to coordinate the shoot with the lake patrol or local authorities whatever those are, for safety and legal purposes and just because it’s th right thing to do.
As to rain-outs, you still need to get paid for the gear rentals and the folks who gave up the chance to do something else productive in order to be available for you. Discuss what’s fair, half-day or full-day if postphoned for weather. Book two shoots about three days apart to cover the weather. Where I live the cycle is pretty much seven days, so if day one is cloudy/rain day seven will likely be as well. That’s wjhy I say three days apart, gives the front time to move thru before another one comes in.