There are a good number of ballers here in San Diego who ski mostly in saltwater. We use lots of water to rinse off the boat and ski gear, then flush the engine a solid 5 minutes. Disassemble your fin block and take the bindings off every few weeks for a good rinsing, just like @Moggie suggested.
As for the boat, some of us inspect our exhaust risers annually, and reassemble with fresh gaskets. The risers usually need replacing every couple hundred hours, even with most "freshwater cooling" systems. A dripless shaft seal is worth every penny in saltwater. A few of us douse our engines and drivelines with Corrosion Block every few months. A can is about $20 US, and I think it delays, if not outright prevents, expensive repairs down the line.
Your painted steel trailer is on borrowed time in saltwater -- galvanized or aluminum rigs are the way to go. Most of us run disc brakes because drum brakes basically melt away in a few months, even with diligent rinsing. Some of us use Salt Away or the equivalent, others say it's a waste of money. Your mileage may vary.
Saltwater skis faster than fresh. You ride higher in the water and it just feels more slippery. The nearby desert lakes feel like molasses at first.
We don't have bull sharks that I know of, but we do have jet skiers and rowing team coaches in small chase boats that throw rollers into our course from the no-wake zone they train in. Your bull sharks are probably far more intelligent, sociable and pleasant to deal with.