This cruise industry leader can continue to reward shareholders.Shares of Carnival (CCL 1.37%) have rallied to a spectacular 92% gain this year amid a string of better-than-expected quarterly results. Compared to the pandemic-era disruptions, the cruise line giant has converted strong booking activity and higher pricing into an impressive financial comeback story.Investors have plenty to celebrate with the stock currently trading at a 52-week high. But can this party boat keep delivering positive returns?Le ...