Yes, you can walk up Snowdon, the highest mountain in Snowdonia National Park and in Wales. There are several hiking trails leading to the summit, ranging in difficulty and length. The most popular route is the Llanberis Path, which is relatively gradual (thus making it the longest) and follows the mountain railway up the summit. However, even though it's considered a "walk," it's important to be prepared with appropriate clothing, footwear, and supplies, as the weather conditions can change quickly, especially at higher elevations. Whichever route you opt for, be aware that it involves a demanding 5 to 8-hour hike with limited protection from the elements.