Lǚtú hěn kāixīn, měizhōngbùzú de shì tiānqì bù tài hǎo.
The trip was very enjoyable; the only imperfection was the weather wasn't great.
Tips
memory
美中 = in the beauty, 不足 = not enough/lacking. Even within something beautiful, there is one small shortcoming. Always used to acknowledge a minor flaw in something otherwise good.
grammar
Almost always used in the pattern 美中不足的是... (the only shortcoming is...). It introduces a mild criticism after praise.