PLEASE PLEASE HELP and my fiancée are traveling to Hong Kong January 18th-21st and have some questions:

*We want to be as close as possible to downtown Hong Kong, but not really spend that much money on the hotel. Looking to spend $80-$100 usd/night

*What would you recommend as far as things to see and do for a mid-20 year old couple who like adventure (open to all suggestions)

*We were also thinking of going to Macau, but we are later traveling to mainland China (Wenzhou to be exact), and I heard that once you go to Macau you need to reapply for another Chinese visa. Is that true?

*What is the easiest/least expensive way to get from the airport to the downtown area?

Thanks so much in advance...you guys are awesome!!