STOL="Short Take-Off and Landing".
It's the short airstrip over near the monorail and not too far from the TTC. It's the old runway used by Disney executives when they flew in and out of WDW.
It has not been used for years.
There's been rumors that
DVC might build a resort there, and connect it to the monorail by adding a loading station.
A STOL runway is by definition shorter, and possibly with obstructions at one end or even both ends, such as trees, power lines, etc.
To fly into and out of a STOL airstrip, the aircraft must be capable of STOL performance. This generally means it's capable of a high rate of climb (so it can clear obstacles), doesn't need a long runway to get airborne, and has a slow landing speed (so it can get on the ground and stop before running off the end of the runway.
Hope this helps.