Staying in San Juan del Sur or Granada? Your hostel should have plenty of info on bus times and prices. Check out the map below to start planning your route.
From Granada: Get a direct boat (Monday and Thursday) or get the local bus to Rivas (takes 1 hour), a taxi to the port (10 minutes) and a boat from there (1 hour) to Moyogalpa.
From San Juan Del Sur : Get a bus to Rivas (40 minutes) and a boat from there (1 hour) to Moyogalpa.