Cornwall is one of the most stunning U.K. counties, surrounded by sea, incredible light.. sometimes green, sometimes blue sometimes grey, sand, cliffs, renowned for art, ceramics and culture. May is one of the best months here, when it is daylight from 4.0ish am to 10.30 ish pm. Yep, it rains.. a soft gentle mizzle that lasts all day or a harsh storm off the Atlantic with driving sheets or rain and howling wind. Being there and taking in the experience is what is important. Maybe you have a XF35mm lens to slip in your pocket alongside whichever zoom you decide? Use this for those early morning and dusk experiences at Cape Cornwall and St. Ives when the light is just right and the sun is glowing huge and red, behind banks of cloud and the sky is on fire behind you and in front and you sit in amazement![maybe bring a polarizing filter too]