The journey from our villa in Seminyak to Kuber took about 1.5 hours - due to slow traffic at some parts, but that pretty long drive was very worth it the moment we started on our ATV ride.
Briefing by guide was clear. We were told to travel in a straight line and got exposed to different terrains and sights. Paddy fields, muddy tracks, up and down slopes (some were very steep that I wasn't confident of going through it but if you keep close to one another like what the guide says, it is actually very safe.
We got to ride through a cave and eventually reached a waterfall. Again, I kept wondering how I was going to make it through the narrow and dark cave but it was actually not so scary! Just follow the guide and do not try your own dare-devil stunts.
It could get very hot so I would advice lots and lots of sunblock. Gloves if you want to protect your hands too! I was fully covered from head to toe except for my hands so those became very much darker. Hehehehe.
You can pay additional for the guide to take photos and videos of your ride. We took up that option cos we did not want to carry our phones around. I would advice to be at the front of the group if you choose to do this so that your faces can be captured clearly.
The shower room was also very very very clean. They provide new towels and shower gel so just bring your own change of clothes will do.