How many widths can you swim?

你在游泳池里横向能游几个来回？

《牛津词典》

Can you swim? Yes. I'm a good swimmer.

你会游泳吗？会。我游泳游得很好。

youdao

Can you swim backstroke yet?

你会仰泳了吗？

《牛津词典》

You can swim across it.

你甚至可以游过去

耶鲁公开课 - 欧洲文明课程节选

There's only one highway that connects Costa Rica and Nicaragua (I walked across it, shown above), but you can totally swim from one country to the other if you aren't afraid of circumventing authority.

ENGADGET: Google Maps causes border dispute between Nicaragua and (army-less) Costa Rica

Halong Bay might be fun for the kids, plus you can swim and explore some caves.

BBC: How to explore Vietnam with kids

Every cruise ship that visits The Cayman Islands disgorges hordes of passengers to Stingray City, the reef where you can swim with and touch schools of rays.

FORBES: 10 Most Touristy-Things Travelers Should Do Anyway