The easiest way/ride to go in ngong ping fr. North point and get back where our hotel located?

I hope you refer to North Point MTR Station. Take Island Line there to Central. Walk through an underpass to HK Station, where you can take Tung Chung line to Tung Chung Station. Leave from exit B and walk to the cable car station to take the cable car onto NP360. To get back, just use the same way.