We went around on a couple of paths, also looking on Etna's Park official web site. Due to the hot season, we avoided demanding trails, focusing on two easy paths.
The first trail was Monte Nero degli Zappini (Black Pine Trees Mount). We also found, among nature and old lava flows an unpleasant surprise. Following the indications we read on the park web site, we arrived in front of the 2002 lava flow which cut the path in two so that it is impossible to to go beyond the observation point 6.
We had to go back and it took us a while to find an alternative path, which indeed exists but is not indicated not even on the Etna's Park web site!
You'll find all the information and pictures regarding this path on the section "Etna Trails".