Local buses are very convenient

Dont know.

Yes. Water flow today looks smaller than some other pictures in reviews on here, but we could feel the spray from across the pool and enjoyed the view.

The steps going down and up should take an average of 10-15mins each way, depending on the stamina. At the end of the steps, there are many big rocks before the waterfall, if you need a photo shoot closer to the falls, you will need to walk on these and will take time especially if it is crowded to get a good shooting spot. Also do factor time that you will need to purchase tickets just before you enter, it may vary depending if there are crowds.

I would suggest renting a car so you are not restricted to bus timings. I was there for 5 days and only see 3 bus. I’d recommend the below : Sangumburi crater, Jeju world natural heritage Centre, manjanggul cave, hallasan, seongsan Ilchulbong, zip line adventure park and bomnal cafe. Have a great trip.