Give it your all, even if you are certain that a career in assurance is not what you will be pursuing after the internship.
The connections that you will make, the knowledge you will gain and the experience you will have is absolutely invaluable. Be engaged on all of your assignments, constantly ask questions and offer your help anywhere you can. Your superiors will notice and it will make a difference, and you will enjoy your job a lot more if you are engaged. Engage with your intern class and develop relationships with them - they will be your future colleagues, or valuable connections, and in my case they will also be your close friends months past the end of your internship.