At resorts like Soneva Kiri, where the terrain means that bikes are not practical, we use electric buggies. This kind of transport is far better for the environment than a petrol vehicle, but electricity still contributes to carbon emissions via charging. Batteries also produce toxic waste, so we must be considerate in how we use electric vehicles.
We are exploring options for powering buggies with solar power and in the future this may prove the best choice. For now, however, they remain the best and cleanest choice for transport in certain situations.