Some of my personal faves.

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  Saddlebags, Sun, and On the Run (Book 2) Applejack, Rainbow Dash, and the rest of the Mane Six travel to Los Pegasus on vacation together. by LotusTeaDragon 42,537 words · 157 · 7
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  Treating Her Right Rainbow Dash treats Applejack to a date. by Rated Ponystar 11,622 words · 1,787 · 57
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  Potion Commotion Rainbow Dash is having an excellent day - that is until a desperate thirst drags her from the sky by MellowMabari 26,689 words · 310 · 15
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  A Dash of Apple Applejack tries to teach Rainbow Dash how to cook. Naturally, disaster and awkwardness result. by Lycan_01 45,529 words · 597 · 26
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  Trial Run Rainbow Dash and Applejack are convinced that a relationship between them wouldn't work. Rarity believes otherwise. Determined to prove her wrong, Rainbow agrees to a 'three date trial' with Applejack... by UnlicensedBrony 19,940 words · 668 · 14