Aperol Spritz. In the sun, pre-barbie, no contest! Or anything involving Prosecco and white peach juice or limoncello. Any of those and you end up with an unsuitably large glass of Prosecco for your second drink. What's not to like. Plenty of ice cubes at the ready in all cases.
Or just a gin and tonic. Plymouth gin, ice and a slice with Schweppes tonic (never Slimline). I mean, beat that.