Best option for 6 adults 1 kid HK airport express to & from plus other traveling to Disneyland ?

I suggest you take shuttle bus S1 to Tung Chung Station first. At Tung Chung MTR Station, you can take the subway Tung Chung Line to Sunny Bay, where you can easily find Disney Resort Line which can take you to the scenic area directly then.

To save time and for convenience, you can also take two taxis to reach the resort. It may cost 120HKD per taxi.