There's just so much space between teams that from a survival standpoint, they're all making the right choice to stay put and conserve what strength they have left for whenever they're forced to fight by either Ice or the circle closing in on them.
From a content standpoint, it's boring to see them all sitting around, but that isn't the contestant's fault. Not only is the land too big but the contestants aren't being fed enough, which only contributes to the low energy nontent. I'm sure Ice thought the same thing Sam and Jet thought in S2, starving will make them go crazy, instead it just makes them do nothing.
I'm also confused about this energy drink sponsor. The CEO came and talked about how he wanted to get his brand out there, but he isn't giving the contestants any energy drinks. Just earlier a staff member delivered one can of F3 energy drink PER TEAM. Not contestant, team. Why would you only give one can to split amongst the team instead of giving one to each contestants? Doesn't make sense from a sponsor stand point, nor does it make sense if you're trying to get the contestants to be more awake.