Balloons?

"Where are we going now?" Brad's question came a while after the group had moved away from where they had spotted the giant mossy sloth. 

They had walked quite a distance. The river was still nearby, but the trail that they had taken was forced to alter due to the terrain. Small streams that entered the rover had caused the terrain to have larger pools of water. Ideal places for beasts to hide within the murky water near the river and attack. 

Therefore, this change in course was required. Not that it was a bad thing. The group had to cut back in to the main jungle to be able to reach the small dungeon that they wanted to stop at.