Run by Roland, the Kudat Turtle Conservation Society is based at the Lupa Masa Bavang Jamal Homestay. An education centre has just been built here and it's possible to assist the society on night vigils of local beaches to protect the eggs of green and hawksbill turtles. Check the website for a list of long-term voluntary positions.
To get here from Kudat, call Driver Peter on 019-802 0084. It should cost around RM50.