Unfortunately, there’s isn’t one. The best we have for seeing gyms right now is Campfire, since the split from Ingress. And sponsored stops may not fully get revealed to us, since they are business deals, and that info may not be allowed to be fully disclosed, depending on the sponsorship agreement.
If you’d like, we do have a thread going in regards to haveing a Wayfarer map here: Community Feedback: The Importance of a 'Wayspot' Map