Pony trekking and biking may be easier if there are differing levels of ability. There are a number of places that organize hiking trips where a taxi moves your luggage so that you only need a day back. We did a three day hike in Andalusia last spring which was gorgeous (probably too hot in the summer) and have another one scheduled for England’s SW coast next month. The middle section of Hadrian’s wall is amazing too.
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