Hi Cinnamon...You need to create an emitter for realistic-looking steam...Pick a prop and make it invisible (I usually just use a candle so I can find it in the prop list if I need to later) then place it just below the surface of the water in the center of your hot tub...Try the following emitter settings and keep in mind to use cum instead of bubbles and that the Spawn cube X and Z determine the width and length of the steam as it is coming up from the tub...In the case of this screenshot, I used about 325 for each...You may have to adjust this depending on how big your hot tub is.

Particle life: 5
Emitter life: 5
Particles per sec: 9
Speed: 50
Start scale: 1
End scale: 3
Fade in: 50
Fade out: 50
Check enable fade
Alpha scale: 0.10
Spawn cube X: 325
Spawn cube Y: 50
Spawn cube Z: 325
Normal X: 0
Normal Y: 1
Normal Z: 0

It should look like this when you are done:



Hope this helps...Have fun