No, really: take a hike! If you both enjoy fresh air and a good workout, get outside. Want to make some pretty reminders of your lovely time together? Grab a waterproof disposable camera (just in case you sweat on it or it begins to rain, not to mention the possibility of dropping it) and snap some great shots throughout the day! It'll make a delightful souvenir, or perhaps even a gift for the future.
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