This is the 11919th most frequent Spanish word.
imaginable
Capable of being imagined.
Here, 'imaginable' is used as an adjective to emphasize the extent or quality of amazement that can be conceived.
Esa película tiene el final más increíblemente imaginable.
That movie has the most incredibly imaginable ending.
In this sentence, 'imaginable' describes the superlative nature of the effort applied, implying it is the highest conceivable effort.
Nuestro equipo trabajó con el esfuerzo más grande imaginable.
Our team worked with the greatest effort imaginable.
Here, 'imaginable' qualifies 'feature,' suggesting that the park includes all types of features one could think of.