I've recently got hooked on these. Here is flat land, but many interesting places, tracks you cannot take a car through, and the wind to fight.
Had a mishap though, was paddling fullspeed on a new bike when to my utter horror I found out, the hard way-, that the steer was not fastened to the front fork. So, I was catapulted forwards for eternity, - could have read a book while I was in the air. Landed professionally, but speed and gravity took 2 ribs into the damage zone.
So, I tightened that steering bolt and keep paddling at top speed

(It's almost 3 weeks and although I can work with a shovel or a fork I can't sneeze yet, hehehe)