According to the Chinese calendar, 12th June (Wed) will be a great day. It will be wonderful to have a picnic enjoying the fresh air! And among the picnic sites, Tamar Park is one of the best choices where you can see the Victoria Harbour just beside the Central Government Offices which were designed by a famous architect.
As stated by Section 18 - Unlawful assembly under Cap. 245 Public Order Ordinance , "When 3 or more persons, assembled together, conduct themselves in a disorderly, intimidating, insulting or provocative manner intended or likely to cause any person reasonably to fear that the persons so assembled will commit a breach of the peace, or will by such conduct provoke other persons to commit a breach of the peace, they are an unlawful assembly."
So you can go alone but you are also free to meet new friends there and discuss whatever you want while sharing your food. Please remember to bring a lot of water, sunscreen, snacks, mosquito repellent, a mat, as well as an umbrella, as the weather forecast says that rain is possible on that day.