How are gatsby's parties like an amusement park? and what then does this suggest about the host?

Gatsby's parties are like an amusement park in the sense that there is alcohol, fun commotion and people from all aspects of life. This suggest that Gatsby himself is fun and really a mystery since nobody really knows who he is.

An indirect object precedes the direct object and tells to whom or for whom the action of the verb is being done.

The indirect object in this sentence is " us " . 

pro -- subject
showed -- verb
showed what ? how to return a serve -- direct object
showed it to whom ? " us ", indirect object <==