Manado haritasında DAMRI KSPN Manado-Pantai Paal Minibüs hattı

This DAMRI bus originates from the airport, but on request (WA 082193084450, indonesian only) they will pick you up around terminal Paal Dua. Depending on the passengers it will stop in Pelabuhan Munte, Casabaio, Pantai Pulisan and Pantai Paal.
Departure and return hours are a bit flexible, but as the bus returns to Manado a daytrip to the beaches is possible.