Kraken, yes. Manta, it depends on the crowd. Earlier this season my husband and I could get a couple rides on Manta first thing in the morning. Last time he went (on June 30), he did the passholder early opening and was planning to stay for a couple of rides after park opening, but there were apparently tour groups and tons of other people, and they all headed toward Manta so the line extended far out of the queue right after 9.