Answer:
I am a busy worker who is a water mammal.
A large oasis in the desert. Come with cash and leave with none. What am I?
What is the word that even in plain sight remains hidden?
rub me and a genie might appear
I am a small paradise surrounded by dryness and heat.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.