Margaritas are the most common. It requires tequila, triple sec, and lime juice. Or you can buy the premixed stuff in the bottle (usually cheaper but not as strong, might be a good choice). They have strawberry also.
Other than that, try Daquries, but I have no idea how those are made other than rum and fruit juice (maybe that's it?). Girls like those
My favorite summertime drink behind the margarita is a mojito. It's not made in a blender though.
Simple syrup, 2:3 parts sugar:water (I use a standard spoon for measuring out enough for just one person)
Add to a tall glass with ice cubes and a sprig of fresh mint. Crush mint on sides of glass, leaving it in.
Add white rum (I usually do half a glass, which is 4 shots)
Add splash of lime juice
Top with club soda (I use seven up because no one here stocks club soda (really)
It gives you minty fresh breath, which might come in handy later
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