A trip to Azores

Hello everyone,

I'm planning to visit Azores the last week of May. I will definitely fly to Ponta Delgada, and then I don't know if I will only stay there or go to other islands. I like hiking, and so that's something I will look forward to do. I don't have a driving license, and so I'm still hesitant if I should go on with my trip, as I see online almost everyone saying you need a car. What do you think?

Also wondering how's the weather in May?