Here's a breakdown:
* "Esta bonito este día" - "This day is beautiful"
* "Esta" - This (feminine singular form)
* "bonito" - beautiful
* "este" - this (masculine singular form)
* "día" - day
* "hay que disfrutarlo" - "we should enjoy it"
* "hay que" - it's necessary to, we should
* "disfrutar" - to enjoy
* "lo" - it (referring to the day)
The phrase emphasizes the importance of appreciating and making the most of a pleasant day.