Gentle waves lapped upon a beach, Celestia's sun shining with it's usual radiance as ponies pranced and played on the beach. Sand castles were built and demolished, and fillies were buried, only their smiling heads poking out.
While a bit older than most of the ponies around her, Twilight Sparkle found herself in very much the same situation. That is to say buried up to her neck in sand. Rainbow Dash stood nearby, shovel clutched in her mouth, admiring her handiwork. Twilight had a silly grin on her face, turns out taking a vacation wasn't such a bad thing after all. Spending time with Rainbow made it all the better.
With a pop she teleported out of her sandy prison, still covered in sand. She shook herself, trying in vain to dislodge all the annoying gritty particles that stuck stubbornly to her coat. Rainbow cracked up more, dropping the shovel into the sand. "You'll never get rid of them all that way, come on in, the water is great!" She beckoned, flying up and then cannon balling into the ocean water with a mighty splash.
Getting a running start, Twilight chased after her marefriend. Her progress slowed as she met resistance from the waves coming in. Rainbow lazily paddled, watching her marefriend come closer and closer. A particularly large wave came in, upending Rainbow Dash, much to Twilight's amusement. The unicorn burst into her own laughter at the pegasus' misfortune, only to befall the same fate.
Rainbow sputtered, trying to get the foul tasting water out of her mouth. Twilight noticing this asked, concern her most prominent tone, "What's wrong Rainbow!? Are you alright?"
"Y-yeah. I'm fine Twi." replied the pegasus, wincing. She'd crashed earlier, slightly scraping herself. The shallow cuts now stung, annoying the pegasus to no end. A look from Twilight caused her to reconsider, "Well, the scrapes from the earlier... mishap are kinda acting up."
"This is salt water, that's why they're stinging." The unicorn explained, picking up her cyan companion in her magic. With a flash they found themselves on the beach, still dripping wet. Reaching out with her magic she picked up their towels, wrapping her own cyan one around herself and the lavender one Rainbow used found itself on the pegasus' shoulders as well.
"Come on back to the hotel, take a shower and wash away all the saltiness..." The unicorn beckoned. Leaning close she whispered right into Rainbow's ear, "And then nurse Twilight will kiss all the pain away."
Rainbow's grin at that moment would make even Pinkie jealous...