Child fare; 4th day fare;

Hollywood hotel; 4D trip; 2A + 2C;
a. HK$300 meant for 2 ways trf from airport? can use the return trip on the 4th day.
b. How much do we need to pay for the child card, if HK$300 for adult.
c. Where to locate the booth selling airport express card at Terminal 1?
d. buying a express card, showing passports and etc will it take long to complete the transaction?
e. Est. Travelling time from aiport to Disney Resort?
f. read the above replies, we need to top up the card for the 4th day other destinations; if the balance which topped up on the 4th day will be refund together with HK$50?