It would be "Mi vacacion estaba divertida"
Why?
Estaba is the past tense for estar.
So you could use estar, but you would be using the past tense.
Hope this helps!~
Pregunta qué talla llevo.
Reciclar
Es importante reciclar plástico y papel para proteger el medio ambiente.
It is important to recycle plastic and paper to protect nature.
