There are now like three locations where you can admire and see the snow and ice sculptures - Zhaolin Park, Sun Island, and the Snow & Ice World. All require entrance tickets in excess of 100RMB each. The biggest is probably Snow & Ice World, but all will be crowded. And they are best admired at night where the multi-coloured lights bring the sculptures alive.
However, I actually enjoyed some of the other attractions besides this number one attraction! The main tourist street of Zhongyang Dajie (中央大街 ), a cobbled pedestrian street, makes for nice browsing with Russian influenced architecture, some dating back 1900s. The Church of St Sophia, the most photographed picture in Harbin, is well worth its shutter time especially early morning or late evening when it is bathed in the winter sunlight. I also enjoyed the walk across the Songhua river, where you know as you reach the middle of the river that this view is only possible in winter. And the amazing winter swim that the locals partake, though having to pay an entrance fee caught me off-guard for a moment (and then I remembered I am in China...)
I've always enjoyed winter, though in Dongbei (Northeast China), you have to be properly equipped for it. A number of friends are particularly concerned about visiting Harbin since many are worried about the extreme cold here. But once you're properly well attired, Harbin is really quite enjoyable!