In a large bowl, whisk together the coconut milk, lime juice, soy sauce, honey, minced garlic, ground ginger, and red pepper flakes (if using). Season with salt and pepper to taste.
Add the chicken thighs to the marinade, ensuring they are fully coated. Cover and refrigerate for at least 1 hour, or up to 8 hours for more flavor.
Preheat your grill or a grill pan over medium-high heat.
Remove the chicken from the marinade, letting any excess drip off. Discard the marinade.
Grill the chicken for about 6-7 minutes per side, or until the internal temperature reaches 165°F and the chicken is nicely charred.
Remove the chicken from the grill and let it rest for 5 minutes before slicing.
Serve the chicken garnished with fresh cilantro and lime wedges on the side.