My absolute favorite summer cocktail is the Mojito. I have a huge mint plant that started from an $8 plant I bought at the grocery store - on the 4th of July I had a party and pulled 150 leaves off of it for Mojitos, couldn't even tell it had been touched. If you'd like to know how I make perfect Mojitos, check out my youtube video here -
how to make a perfect mojito - YouTube
Regarding gin and tonics, I've just started using Jack Rudy Tonic Syrup and a soda siphon to make them. I can't tell if it's really better or if it's the fun of using the soda siphon, but it is more fun!