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have a whale of a time
To enjoy yourself very much; to have a very good time
a drop in the ocean
An amount of something that is too small or unimportant to make any real difference to a situation
the coast is clear
There is no danger of being seen or caught
a fish out of water
A person who feels uncomfortable because they are in an environment that is not familiar
the world is one’s oyster
There is no limit to the opportunities open to you