When are you visting? The Safari Park is straight east from Legoland about 30 minutes, the valley gets very hot during the summer. The Zoo is about the same distance but south from Legoland and cooler since it's closer to the coast and has a lot more shade. I really love both but for young kids, I would probably do the zoo. There are a lot of hills to walk so we usually do the Express Bus to hop on and off anywhere we want to stop. The guided bus tour is also a must.