Vacant land if you can acquire suitable agreement over three or more years could have many minimal business activities.
I've been watching someone convert a former paddock into what I'd guess is a motorbike track with jumps. They've been slowly working at it for a couple of years.
With a wide area and plenty of room it'd also be ideal for a training area for those who wanted to start learning up on getting skills to operate different machinery. Even trucks and tipping so someone can get some experience. I got a fork lift ticket when I was back from dropping out of uni, from a guy who could certify fork lift driving tickets. All he had were a couple of forklifts (may have simply borrowed them for the weekend) and offering training while having an agreement with owners of the large garage to train on the weekends, less than 20 years later, he had expanded to many other machines (coal mines are in my area,) a number of training points, a large full time successful business.
