We've been to Lanzarote and really liked it. We stayed in Playa Blanca, hired a car and explored. There was plenty to do for a week and we were really pleasantly surprised by how nice the island was and how sunny but not boiling the weather is.
Now we're considering going back to the Canaries next summer and I want to at least consider the other islands. So which are the nice areas, which are the tacky ones to be avoided, and what is there to do? We're not a family who wants to sit by the pool for a week. We like to get out and visit towns, markets, caves, volcanoes, animal parks, etc.