how to go to ocean park from rambler oasis hotel via mtr?

on our last day we are planning to go to ocean park...our problem is our luggages, we will check out of the hotel in the morning and all our luggages will be with us...
a. is there a place we could leave our luggages so we could enjoy ocean park before our flight back home
b. our flight back is 7:30pm what time should we leave ocean park to catch our flight?
c. were to ride the bus going back to the airport? what bus to take and how much will be the fare? how long is the travel time