This distinguished gentlebeast appears to be a Smooth-handed Ghost Crab (Ocypode cordimana)!
They are members of the Ghost and Fiddler crab family Ocypodidae, and have a highly varied diet of plant/algal matter, other invertebrates, vertebrates, eggs, and carrion. They’re opportunistic and will try to get anything they can eat!
This species is also widely distributed across the Pacific and Indian oceans, where they can be found most active at night on beaches. Like other ghost and fiddler crabs, they typically stay hidden in their burrows during the day to avoid predators.
Grapes, as shown here, make for a delightful treat for captive Ocypodes; however, it should only be a treat and part of a balanced and varied diet including fish pellets, shellfish (such as clams), and veggies.
[ImageID: A small tan-and-beige ghost crab of the species Ocypode cordimana sitting on a sandy beach during evening hours. It has two large white claws with its right claw being slightly larger than the left. It has two black-colored eyes on eyestalks and a slightly pale pink-colored mouthparts called mandibles, maxillae, and maxilipeds. /. end ID]