Joining a Chinese-language stargazing tour at Lake Tekapo was excellent. The stargazing location was completely free of light pollution, and the staff were very attentive, providing chairs and blankets as it got quite chilly at night. The explanations were detailed and professional, and they even included a complimentary photo opportunity for each participant at the end. It was great value for money. If you drive yourself, the staff will add you on WeChat beforehand and provide detailed directions.