Thank you so much for your generous hospitality.
非常感谢您慷慨的款待。
You must give me the chance to return your kindness when you visit here.
您光临我处时我定要借机答谢您的盛情。
Thank you very much (ever so much) (most sincerely) (indeed)(from the bottom of my heart).
很(非常)(最真诚地)(确实)(衷心)感谢您。