went with my 2 kids to macau for 3 days 2 nights...they ended up at Kids City a couple times and just wandering around the malls...i'll be staying at the Westin for sure next time (this time we were at the hyatt - which is great for adults) since there is more to do. not sure how old your kids are (mine were 2.5yrs and 8mths) so any hotel room / new environment is fun for them!
