Hong Kong is a great place for older kids, since many of the attractions are geared toward them and even offer discounts for children, sometimes as much as 50%. In addition, public transportation is half price for children. As for very young children, keep in mind that there are many stairs to climb, particularly in Central with its elevated walkways, and in subway stations, making child backpack carriers easier than strollers. Also, young children may not be welcome at finer restaurants.
As for hotels, many allow children under a certain age (usually 12 but occasionally up to 18) to stay free of charge in their parent's room. Generally, only one child is allowed, or there's a maximum limit of three persons per room, and there's no extra charge only when no extra bed is required. Baby cots are usually available free of charge, and most hotels also offer babysitting.
Recommended family travel websites include Family Travel Forum (www.familytravelforum.com); Family Travel Network (www.familytravelnetwork.com); Traveling Internationally with Your Kids (www.travelwithyourkids.com); and Family Travel Files (www.thefamilytravelfiles.com).