Are there several swings near Ubud, which one would be the best for a 26 year old
I will recommend Ceking Sari Luwak Coffee.
This place is right next to Tegallalang rice terrace.
Cost - 100-150k IDR per person. They give two rounds - one facing valley and one facing cliff - about 20 swings each way.
Live and let live, i also would like to go on a swing.