If I wasn't tea totalling until NYC, I'd be loopy on Pimm's Cups and Gin and Tonics. These are my two preferred drinks, and super for hot summer days.
English cucumber wedges
Pour the ginger ale and Pimm's over ice into a glass at a ratio of 3:1 (unless you like it 1:1 like I do). Add a wedge of cucumber, an orange slice an 1 or 2 lime slices. Stir gently. Enjoy.
I bought a book about gin a few weeks ago, but haven't opened it. I'll take a look at it, and maybe read it on the plane and let you know if it's any good.