Legoland

Legoland is a main attraction in Carlsbad.  The best time to visit in my humble opinion is now when the crowds are gone and the weather is beautiful.  Legoland on a quiet, October day is fun.  Legoland during the crowded days of summer is stressful.  Go on a weekday if you can but check their operating schedule.  During the off season they close on some weekdays.