Learn Spanish (Latin America): El parque está ocupadísimo cuando el día está soleado. - The park is extremely busy when the day is sunny.

The base adjective here is ocupado (busy). To add the -ísimo suffix—which acts as an absolute superlative meaning "extremely" or "super"—you first drop the final vowel of the original adjective. So, ocupado drops its final o and takes -ísimo, becoming ocupadísimo. Because parque is a masculine singular noun, the suffix keeps its masculine singular -o ending.

Does ocupado really work for places? I thought it meant a person is busy or a bathroom is occupied.

Yes, it works for places too! While you will often use ocupado to describe a busy person or an occupied seat, applying it to a public place like a park, restaurant, or store simply means it is bustling, full of people, or currently in heavy use.

Why do we use está instead of es for both the park and the day?

We use está (from the verb estar) because both ocupadísimo and soleado describe temporary states or conditions. The park isn't inherently, permanently busy—it is just in a busy state right now. Likewise, the weather changes, so being sunny is a temporary condition of the day.

I originally learned to say "it is sunny" with hace sol. Is está soleado different?