Quote Originally Posted by Moonfuzzy
Intro = no jumps.

From what I remember, almost all the caves I saw in Mexico had a line running the perimeter of the cavern, and then jumps if you wanted to do any penetration into the caves themselves. It seems that the way these caves are set up means that there are almost no true intro dives (unless you bring a really BIG reel and run your own line in).
There certainly are lots of caves like that, where you would be wanting to jump off the cavern line, which doesn't meet intro standards, but also plenty where you don't have to do that. In a couple of minutes I just counted out to myself over 20 tourist intro dives where you would be laying a primary line straight from open water, and I am not particularly familiar with tourist diving here. For all of those a 300 foot reel will suffice (and for many 100 foot would do it) if you know the way.