Type II Fun

[BaltimoreSkins]

What is everyone's go to type II fun?

I prefer trail based running activities. Some buddies and I annually do a 120 mile relay race that involves night trail racing and limited opportunities for sleep. I also do at least one ultra a year. I'd like to do a backyard ultra next year.

I've done some high peaks in the Adirondacks, depending on the peak is type II fun.

I want to try a multiday mountain biking event but I focus so much on running and not sure I want shelf that for a year to train for an event like that. Anybody have any experience there or suggest another type II fun.