I knocked around in Tianjin this holiday.

这个假期我去天津逛了逛。

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　　knock around，比较常用的一个意思是，漫游，从一个地方逛到另一个地方，通常没有很明确的目的地。英文的解释是“to wander from place to place”。
　　例句：
　　I think I'll go and knock around in Qingdao. Hit the beach, maybe a little surfing, you know. Just take it easy, maybe spend some time at old friends.
　　我要去青岛转转。逛逛海滩，可能做点冲浪。就是放松一下，也许再花些时间去看望老朋友。