Springtime has been kind to investors in the country's three largest cruise line operators. All three stocks are up at least 42% in the second quarter. Maybe it's not a surprise that the larger the player -- by revenue -- the stronger the pop since the end of March.

Carnival Corp. (NYSE: CCL) is up 56%, Royal Caribbean (NYSE: RCL) is up 46%, and Norwegian Cruise Line (NYSE: NCLH) is up 42%.

Things can get even better from here. We're heading into the telltale summer season, and the next few months will test the seaworthiness of the recent gains. If industry bookings remain strong and passengers keep relishing the experiences, the three stocks could continue beating the market in the second half of this year and beyond.

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Source Fool.com