Firstly,take a rest and have some food.Then,make a decision whether to continue the hike.If you think it's better to return,figure out whether you can reach the foot before sunset.If you insist to climb up,make sure you have enough supplies and you should build a tent before too dark.Then,call a friend or relatives,tell him your situation and try to find some help.写一句话噗 那你又不说清楚，我白写这么多。I will choose a place to build tent and call 911 before I take a rest.