Do some mountain flying. The Lake District is fab. Just don't do it on a weekday as the RAF tend to monopolise the place during the week. Make sure you get a briefing from someone who has done it before and do a lot of reading on mountain flying before you go. If you intend to go low-level in the mountains, do so only in very very low wind conditions and stay on the down-wind side of any valley.
Many will say its super dangerous and you shouldn't attempt it until you've a bajillion hours under your belt, but like all flying, your safety is related to your preparedness and your en-route risk taking.
Also, as many others have said, fly to France. They actually like flying there, so airfields are welcoming, landing fees are rare, and they have fuel at even the smallest fields. The Dordogne is a lovely place to fly around.