I just got this game yesterday and I need to know how to use the water features(lakes,ponds,streams,etc).Can anyone tell me whats wrong?It won't let me make it,just gives me the little water mouse icon.

Make sure you have created a 'pond' for the water to go in, i.e. a valley to fill. Click the water tab, click again in the pond

I've tried making ponds and the like but still no luck...

Could you take a screenshot of how you are doing it, by pressing F10 ingame.

The images will be stored in MyPicutres>RCT3

I just downloaded a island themed park and the water there didn't show up,the ripples where the water was supposed to be were there but otherwise it was completely missing....

Sonds like a graphic bug to me. Update your graphic accelerator drivers or try to disable all graphic features concerning water effects.

Okay I fixed it,thanks for the help.