The most natural Spanish translation is “paraíso tropical.”

Quick options

  • Paraíso tropical = the standard, natural translation.
  • Un paraíso tropical = “a tropical paradise.”

Example

  • Es un paraíso tropical.
    “It’s a tropical paradise.”

If you want, I can also give you a few more natural Spanish phrases depending on whether you mean a place, a vacation spot, or a poetic description.