This was my first visit to the training facility (with an out-of-town visitor in tow) and I found it to be very interesting to see where our Olympic athletes train.
As other reviewers have commented, it can be hit-or-miss in terms of seeing athletes practicing their sports. We were there midday on a Monday, and there wasn't much activity. Nonetheless, just by walking through the facility you could get a sense of what they go through as they train.
We didn't participate on one of the guided tours and just opted to walk the trail through the facility on our own. We picked up a tour map at the visitor center for the mile long walk through the facility. (It also has an audio tour that you can dial into using your cell phone, but we didn't take advantage of that.)
The "trail" is actually a concrete sidewalk, so accessibility isn't a problem. There are drinking fountains along the way which came in handy because it was a warm afternoon and we got thirsty along the walk. There isn't a lot of shade along the walk, so be prepared to spend an hour in the southern California sun (hat, sunscreen). I don't recall that there were any benches along the trail if you wanted to pause and sit for a while.
They have an Olympic torch at the visitor's center that wasn't lighted. I'll return to see if it's lighted while the London games are in progress.
Finally, we didn't make it down to Lower Otay Lake to see if any rowing teams were on the lake practicing.
Our visit was a spur-of-the-moment visit and, before I plan another trip to the facility, I would check out its website to see what activities are scheduled to make it even more interesting.
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