英语翻译:我认为骑马是最健康的户外活动之一

I think horse riding is one of the healthiest outdoor activities.
不要加can't

I think that being on horseback being one of the most healthy outdoor activities
这是你的翻译！！
你下面的 是问 Can't 是否加在你下面的话里吗？

I think that(或者用In my opinion 也可以） the horse-riding is one of the most healthy outdoor activities.
希望有用~