You might also want to try
Guayacanes or Juan Dolio. Neither are overly touristy and the beach in Guayacanes is magnificent. Grant you if you're not staying in one of the AI's in Juan Dolio, accomodations are 2 star at best and most would only be one however most are clean, friendly and affordable. The south coast has great weather and is within easy reach of sight seeing and other fab beaches via public transportation.