I recommend this hike to people with small children/strollers or someone with a mobility issue. The path/hike is paved and easy (and you can pay for a ride up if you don't want to walk it). There are little side things you can look at--the Hawaiian village, the little nooks with native plants. But, the main attraction of this short hike is the waterfall at the end.
It's fun to swim beneath the waterfall in the cold, cold pool. But, you will not be alone. This is a heavily trafficked hike. And, you must wear a life jacket (provided by the lifeguards) to swim. It's still worth it, though, even with all the people.
Some tips--maybe wear water shoes as getting to the pool you have to clamber over rocks and dirt. Also, wear bug spray as the mosquitoes here can be fierce. You don't really need a towel as the walk back down will dry you off, so I wouldn't bother with carrying one. It's a nice gesture to tip the lifeguard a dollar or two. Parking is free, but admission is not--and it's a little pricey. That's the reason for my three star rating. There are lots of falls to see for free on Oahu if you know where to look.
The real attraction of Waimea isn't really the falls; it's the bay across the street where you can swim. It has a nice, sandy bottom, easy swells in the summer, and bathroom facilities. If you take little kids to the bay, keep a close eye on them though, the shallow part is a thin ledge before the bottom drops off to about 6 feet.
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