I love hiking in or along mountain rivers and swimming in dark brown pools, so since the day that I heard about it I've wanted to hike up to Crystal Pools, near Gordon's Bay. The problem was that we could find very little information on the Web about exactly where the hike is located and how to purchase permits. After scouring the Internet we spent 2 hours of playing telephone tag, trying to find someone at various nature conservation departments to tell us (a) where the hike starts and (b) where to purchase a permit.
We called 13 (or more) telephone numbers from Cape Nature to the Koggelbaai Nature Rerserve and everyone gave us a different story. After driving out to more or less where we imagined the hike would start, we eventually we located the unmanned entrance to the hiking trail and found a visitors book that contained a page that had been stamped with an official-looking stamp. This (the last number at the dead-end of telephone numbers) proved to be the right one! The ranger on the other end of the line used his 2-way radio to contact the ranger on who should have been manning the entrance to the hike station... and we were told that it was okay for us to go in without purchasing the R15/p permit. What an anti-climax it was after 2 hours of phoning around!
So, to save you the trouble, see the Google Earth image below (and this map) that shows the location of the gate (where, according to some, you can purchase the permit) as well as the location of the three pools - about 1.7km up the Steenbras river. Today's main photo is of the bridge that crosses over the river, and you can see that bridge to the bottom left of the Google Earth photo below.
To find the entrance to the hike, drive about 6km outside of Gordon's Bay, towards Rooi Els. You'll find parking about 100m after the Steenbras river bridge. Leave your car there, cross the road, and walk back in the direction of the river. You'll see the little wooden cabin where you can theoretically purchase a permit.
Before planning your day, be sure to call 021 856 4975 and confirm that the gate will be open and that you are able to purchase a ticket there. Also, just because we had such a run-around, be sure to get the name of the person that you speak to at that telephone number. :)
EDIT: See Githa's comment below for more information about booking.
If you'd like a preview of what you'll see on the hike, take a look at Coda's photostream on Flickr - he has a few great photos of the hike and the pools at the end.