we just did this a couple weeks ago. We stayed at HOJO and drove to
Legoland for a day. It takes about 45mins to an hour depending on traffic. You take I-5 south to Exit 48 Cannon Road and there are signs from there. We got there when they opened at 10 and where done around 3:30 or so. We were able to find a deal online for tickets. I believe it cost $49 for an adult... Not sure though. Go to there website and it should say.