Join PATH and Friends of NELHA as walkers, runners and riders tour the Natural Energy Laboratory of Hawaii Authority (NELHA) on May 10 at the Gateway Center at NELHA in Kailua-Kona. This educational event promotes cycling and walking as a viable, no-emission transportation alternative. Proceeds will benefit co-sponsors and the Kona Earth Festival. Refreshments will be available. Cost ranges from $25 to $50 for adults, $15 to $40 for keiki. For more information or to register, e-mail Laura at lmd@hawaii.rr.com. Visit www.nelha.org.