Martha,
My husband went on a real estate tour with agents who are listed here in the International Living’s contacts and resources information. They are Amy and Gerardo Pinoargote and their email is gpinoargote@yahoo.com
He was very pleased with their service. They offered a group tour (14, at the time he was there) or private. He opted for the private tour which was about $399 and the group tour is a higher price. His tour included 2 nights in fine hotels, meals, transportation and touring the coast. We can recommend them highly.
We fell in love with the same area you are describing, and ended up buying a brand-new beachfront condo 3 km south of Canoa, built by an American builder which made it easy. Never thought we could afford our dream of our own beach condo on the sand, but that’s what buying in Ecuador is all about! Good luck on your search!