Hey,
Thanks for reaching out to us!
There are several factors to this one. First, you’d have to determine how you were managing the activities from a WordPress admin perspective. You would need some sort of fields to collect the activity details such as the activity name and location.
You would then have to follow the Themer’s Guide and work with the Google Maps API to generate new map which pulls the addresses from the custom meta from above to create your map.
I’m sorry I’m unable to give you a direct response on this one. Hopefully this will help to get you pointed in the right direction though.
Let me know if this helps.
Thanks!