My favourite thing about summer is having the back door open all day (with chain fly screen) and well into the long light evening. Living in the country side is wonderful this time of year. We have swallows zooming down and drinking from the pond, and bats at night.
The cats love wandering in and out, we can hear the birds (we have rare turtle doves) and I am always popping outside to sit and have a coffee and just enjoy it.
The worst thing is horse flies. They land sneakily and bite hard. I then have a huge painful lump come up, I have to resist scratching it.