Ms.marvie,
What hotels are closest to airport?
Hotels in Tsing Yi area are much closer to the airport, for example, Rambler Garden Hotel.

Which theme park is closest to airport, disney or ocean park?
Of course Disneyland. Just take S1 airport shuttle bus to Tung Chung. It costs around HK$3.5. Then take Tung Chung Line (mtr) to Sunny Bay, change Disneyland Resort Line to Disneyland.

i want to do both parks but ill prolly startr with the farthest first
You may take S1 to Tung Chung, take Tung Chung Line to Hong Kong MTR Station and then walk to Central Station. There you have to take Island Line to Admiralty, exit B to take No.629 bus to Ocean Park.

Is Ocean Park close to oter famous tourist spots?
You may get back to Central and then go to the Victoria Peak and then go to the Avenue of Stars in Tsim Sha Tsui to enjoy the Symphony of Lights.