When we are thinking of what could please God the most, we should know that it is only the Son, Jesus Christ who is the only person or the only thing which pleases God the most in the entire universe. There is no other person who pleases God more than the Son. There is no other thing in the universe who can please God the most. The Son alone pleases the Father the most in the entire universe.
In our lives, if we want to please God, we must follow the footprints of the Son. We must do the will of God as the Son did. The Son didn't do any other thing outside what the Father wanted. He didn't pursue his our will at the detriment of the Father’s will. He submitted himself completely for the will of the Father.
The Son was obedient unto the Father even unto death. He counted not his own life so dear to him. He honoured the Father totally. In everything, he was obedient to the Father. He accepted the Father's will and does everything which the Father commanded Him. It is only the Son who pleases God the most in the entire creation.