1предложение проверьте

I lay in the sun and swam/-я загорала и плавала.
Не так ведь да? запуталась

а, и еще: "Пока мы плавали на катере, за бортом плескались дельфины"- While we were swimming by boat outboard were splashing dolphins

помогите пожалуйста!

"Как я провел лето? "
I was sunbathing and swiming.

While we were swimming by boat dolphins were splashing outboard.

Насчет уместности глагола splash сомневаюсь, может, подыскать другой?