There aren't too many activities to keep you busy here, but there are trekking options from Palu to Lore Lindu, Bada Valley, Dumoga Bone and Halmahera Maluku to name a few. English guides in this town are very hard to come by, Indonesian speaking guides are easy enough but it takes a lot of the fun out of the trek when you don't understand a word the guide is telling you. I managed to find one English speaking guide who took us on a four day hike through Lore Lindu. It was a fairly simple route but I think he can tailor make hikes if you have any preferences. His name is Adri and his email address is email@example.com.