I know I’ll get flamed for this but please do not cheat yourself. Yes it is a fun run but this is dishonest. If you want to do the 5K please complete the 5K. If you want to walk the course and only do one lap fine. If you are putting in the work to train for your first event, you have set this goal and you can accomplish it. It is a fun event and even if it might be a little boring (and hot) you will enjoy it and the medal will be well deserved.
Because this is a fun run, you are only hurting yourself and tarnishing your accomplishment. If you just want the medal, message me, I have extra and you can have one of mine.