The chest
It contains a lot of resources. First you need to open it and then you can search it two times. Each time you search the chest, you will get two resources.
The hotel guests
Fix and clean their room so they can go and rest before the timer runs out.
If you cannot do it on time you will have to apologise and convince the guest to go to the room.
Damaged wires
The lights can be turned on by fixing wires in the floor. Be aware that you need gloves to do it!
The smoke
Fix the ventilation to get rid of smoke.