I found this bumble bee exhausted and having a hard time moving, however after offering her some sugar water the bee happily lapped it up and began looking more energetic. It then decided to climb aboard my phone which was sitting a few feet away and rest for a while longer. Finally, after what appears to be a good bee poop on my phone to thank me it flew away apparently rejuvenated.
Something to note that I found in my research for helping exhausted bees such as this one is that it is important to use a mix of sugar and water and NOT honey like you would find in your kitchen. That honey is imported and apparently not healthy for them to consume.