I was in Honolulu looking up a restaurant or something on Google maps and I saw a marker for "Manoa Falls". I had never been and I assumed it would be like Opaekaa Falls or Wailua Falls in Kauai. Both of those are just off the road. You get out of your car, walk 50 feet, see the waterfall, get back into your car. At worst I thought it might be like Akaka Falls on Hawaii which is nice paved with steps and walkways with rails.
Instead it was a dirt path about 1 mile long. It was a drizzly day and so it was all really muddy and slippery.