ok, if you want to go to China, there are three main ways:

1.Get a vehicle, and sail/fly there (make sure you have enough fuel)

2.Pay someone, and get them to sail/fly you there

3.get 5 stars and and exchange them for the underground passage key. (you will need to fight guards, they are tough!!!)

Trick for underground passage, let you only fight 1 guard
1.get a team leader who has a spawn point at the destination and the key.
2.fight your way through the first guard
3.go next to where the second battle starts
4.team leader puts out his tent
5.team disband in the tent, team members stay in the tent
6.team leader spawns to the destinaion
7.team leader runs to the passage exit, and goes into his tent
8.team members join team with leader inside tent
9.team leader leads team out, no fighting needed for the second battle!!!