It is OK for youfirst go to Victoria Peak, and than go to Ocean Park. Well, I think it is better to go Ocean Park First, then go to Victorai Peak, then walk to see Symohony of light show.
From the hotel to the Ocean Park, you can take bus 171 from Bank Centre, Nathan Road to Aberdeen Tunnel Toll Plaza, then walk to the Ocean Park.
From Ocean Park to the peak, you can take bus 6X from the ocean park to Central, then transfer to bus 1 to the peak.
Then you can walk to Victoria Harbor to the the light.
From Mongkok to Disneyland, you can make full use of the metro. Take metro from Mongkok to Lai King, then transfer Tung Chung line to Sunny Bay. There you can take the disneyland resort to get to the Disneyland.