Pedro is absolutely right; you would probably do well to give Chapala further consideration. It is a complete small city on the lakeside with everything within walking distance. Both we and Pedro live in downtown Chapala. Our previous experience was a few years in Ajijic, which is more of a 'boutique village' and more heavily populated with expats. Chapala is also the 'county seat' and the center of government for the larger 'municipalidad'. There is excellent bus service along the north shore of the lake and that would make your choice of private schools easily available to your child if you didn't wish to drive twice daily. There is also a bus station in Chapala with service to Guadalajara every 30 minutes during the day. Parque Cristiania offers green space, pools, lakefront, picnic areas and shells for musical events, etc. and there is a museum/cultural center nearby.
I will also advise against the coast or any of the lowland cities. The oppressive heat and humidity are intolerable for those brought up in the north. On the other hand, they are so close that they are readily accessible for a quick getaway to the beach in the winter months. Many Lakeside residents take advantage of 'shoulder season' rates for a few days in Manzanillo, Melaque, Barra de Navidad, etc.; all half a day away by car.
The only difficulty in choosing Chapala will be the fact that it will take longer to find a home. Realtors seem to focus on Ajijic and/or the newest crop of subdivisions along the highway. We prefer, by far, living in town in a more normal environment without the complications of 'homeowners associations' and 'group-think.' In spite of being 'downtown' and within three blocks of everything, we have a large yard with gardens and a small pool. We and three dogs are quite comfortable but we did kick out the chickens when we moved in. Chapala is very popular with weekenders from Guadalajara and any house you choose should have a garage; on street parking can get pretty tight, especially at fiesta times.