你好，百瑞格！I think there are many interesting places to visit in Chengdu, and also the foods there are awesome! The weather in Chengdu is pretty warm and you may think it's kind of hot in summer. People there prefer to live a slower pace of life and I think it's a good place to live.
You want to study Chinese there or just for traveling? If you plan to study there, I don't think Chengdu has the best education systems in China. For traveling,1- 2 months are enough.
Here are some interesting places to visit:都江堰水利工程Dujiangyan Irrigation Project, 乐山大佛Leshan Giant Buddha, 庐山 Mt.Lushan, 武侯祠Wuhou Temple, 峨眉山Mt. Emei, 青城山Mt.Qingchengshan, 四姑娘山 Mt. Siguniang, 九寨沟Jiuzhaigou Valley , 三星堆Sanxingdui, 杜甫草堂Dufu's Thatched Cottage, 青羊宫Qingyang Temple, 金沙遗址Jinsha Ruins, 蜀南竹海:Shunan Bamboo Forest, 泸沽湖Lugu Lake, 宝光寺Baoguang Temple, 自贡国家恐龙地质公园Zigong NationalGeological.
Personally, I enjoy Mt, Lushan, Mt.Siguniang, Jiuzhaigou Valley, Lugu Lake very much, the scenery there are really beautiful.
Welcome to China and wish you can enjoy your trip to Chengdu.