The transportation between HK and Macau is convenient. You can go to Macau first. It depends on our itinerary.

There are a lot of hotels in HK which are way more cheaper than hotels in macau... and if you have 2 kids, a lot more entertainment can be found in HK like ocean park, disneyland, ngongping 360, and victoria peak as well as visit the kowloon park and the botanical gardens..You can actually tour around macau in just one day since you're not allowed to enter the casinos in macau with two minors...you can get inside the hotels though but not inside the casino...I suggest you go to City of Dreams Hotel, The Venetian, Grand Emperor, the Grand Lisboa and Wynn Hotel...You also must go to Senado Square in Macau...One more thing, bus transport around macau is free..