Walk a few meters to mtr station of Mongkok, then take Tsuen Wan Line to Lai King, shift to Tung Chung Line to Sunny Bay and then change to special Disney line to the park.
Take mtr from Mongkok to Tsim Sha Tsui. Get out and walk along Haiphong Road to China Ferry Terminal 10-15 minutes later. Take ferry to Macau Marine Ferry Terminal. Walk to its bus terminus. There are free shuttle bus to your hotel. Or you can walk 15 minutes or so to Rio hotel.