Black bears are not a problem in the park. Use caution with food however. This trip is usually available on short notice. Shuttle flights can accommodate any number of passengers. Make it a day trip with an early morning drop off and an evening pickup.
Minimal gear includes warm coat, hiking boots, rain jacket, water, food, and camera of course.
Over niters should be prepared for rain. This is for young and fit. Rope ice ax and crampons may be supplied. This one really gets missed in the shuffle. The ring of fire.