Here's a drink you might want to try for your summer parties or just for a girls' night in: Pink Grapefruit Cocktail. It's really good. One time I used ruby red instead of pink for a different taste.
Pink Grapefruit Cocktail from Alexandra Guarnaschelli (Food Network)
3 1/2 ounces fresh pink grapefruit juice
1/2 ounce fresh lemon juice
1/2 ounce orange liqueur
2 ounces vodka
Garnish: grapefruit wedge
1. Shake the grapefruit and lemon juice, orange liqueur, vodka and 1 tablespoon crushed ice in a cocktail shaker.
2. Add a touch more fruit juice or vodka to taste.
3. Strain into a chilled martini glass and garnish with grapefruit. Enjoy!