discovery bay sounds really nice. there are no cars?? But how can you go to MTR station?? (tung chung?)
I don't need big mall or supermarket nearby, shopping is not my favorite activity on weekends. I prefer places I can walk around in nature.
I guess lamma, discovery bay, and saikung could be a strong option for me.
I don't know about cheng chau island, but it could be similar to lamma.. I have to check it out.