Traveling to Maya Riviera in Mexico on GC and Indian Passport

[nsg_lists]

I think I know the answer to this, but wanted to confirm. We are planning to travel to Mexico for a week with family for vacation. I was wondering if there are Visa related requirements for:
1. Adults traveling with Green Card and Indian Passport.
2. Children with US Passport.

I do not think there is any requirements and we get a Tourist visa on arrival. Can anyone provide links to any official site which confirms the same.

Thanks.