In order to get a full appreciation of the ice art one should really visit the ice park during the day to see how the crystal clear ice sparkles in the spring sunshine. Then, return again at night to photograph the creations are when they are lit by colored lights.
Be sure and bring your tripod. Using a low ISO speed of 100 or 200 and long exposure gives the best results. Hand holding your camera or using flash is not recommended. A shutter release is helpful.
The above photo was taken with a focal equivalent to 50 mm on a 35mm full frame camera.