Carnival Legend underwent its pandemic-era return-to-service shipyard period at Chantier Naval de Marseille. The project included routine maintenance, technical upgrades and application of Carnival's red, white and blue hull livery.

Carnival Legend completed a multi-million-dollar refurbishment at Vigor Industrial Shipyard in Portland that added several of Carnival's newer food and beverage concepts. The project introduced Guy's Burger Joint, BlueIguana Cantina, RedFrog Rum Bar, BlueIguana Tequila Bar and Alchemy Bar. The ship also received Cherry on Top, while existing accommodations and public areas were refreshed as part of the two-week shipyard program. The refurbishment preceded Carnival Legend's 2018 Alaska season from Seattle.

Two-week major refurbishment adding WaterWorks with the Green Thunder waterslide, RedFrog Pub, Bonsai Sushi, Cherry On Top, new entertainment programs, and refreshed pools, fitness equipment, carpeting, tile, and wall coverings.

Carnival Legend underwent a 14-day refurbishment in February 2011, introducing the Serenity Adult-Only Retreat and renovating several existing passenger facilities. The new Serenity area provided an adults-only outdoor relaxation space featuring oversized umbrellas, cushioned chaise lounges and chairs, whirlpool tubs, a full-service bar and ocean views. The children's swimming pool area was renovated with colorful new tiles featuring marine animal designs. The ship's casino was reconfigured to accommodate additional slot machines and poker tables, while new upholstery and seating were installed in the Lido restaurant, main dining room and dance club. The improvements refreshed several of the ship's most frequently used recreational and entertainment areas before Carnival Legend resumed its year-round seven-night Caribbean cruises from Tampa on February 20, 2011.