Don't forget your Speedo and towels.
Hop in, sit in each seat. With the Optima, I'd for sure sit in each corner seat, and at least one "mid" seat.
When in the main therapy seat, activate just the pump for that seat. It only runs on high. open the air valves for that seat and adjust the diverter between full on and fully off. Note the affect the diverter has on the foot jets. And on the calf jets which are in two of the corner seats.
Then turn off this pump, and activate the other, which is a 2 speed pump. This is for the other 3 corner seats. Open the air valves for those jets, and turn the 2nd diverter valve between all the way on, and all the way off. This diverter feeds the 3 corner seats, and the whirlpool jets. Try out each seat, switching the pump from low to high speed, and adjusting the jets in those seats.
Then shut that pump off, and turn on the bubbler.
Then turn the pumps on and off in any combination you like.
If you are considering the stereo option, bring a CD of whatever music you like.
Not familiar with the Sweetwater model, but use a similar strategy. Try the seats, and vary the massage action to each seat as applicable.
Note how comfortable (or un) each seat and setting is.
Most of all, have fun and enjoy yourself.
Brewman