Erawan Waterfall, named after the three headed elephant, is famous for its seven layers of falls (though there are in reality many more shelves and layers than that).
The first layer is not all that much to look at, but just a stream with a few picnic tables. The beauty really begins at the 2nd waterfall where there’s a huge pool of water to go swimming in and enjoy the refreshing falls.
Go even further and things keep getting better and better and quieter (however, unless you go in the early morning, there’s always crowds of people at the falls).
The 3rd level of Erawan Waterfall also provides a great opportunity for a dip.