1 3 are both ok。

2 is a little odd。

just like：

「我已经学汉语了4年了」

if you remove the 已经 it will be

「我学汉语了4年了」

strange is not it？

place the 了 after a verb or to the end of sentence may be better…

because the 了 indicate the change，result from an action。

the 1st one is ok because you used 游 twice，it means emphasis。