In an e-mail sent Monday, Frank Marini, president of Contiki Holidays, announced he is leaving the company to become vice president of sales at Collette Vacations. Marini started his career in travel with Collette in 1994, and rejoining the operator allows his family to move from California back to Rhode Island, where his extended family resides. Marini's last day at Contiki will be November 20. "This was a very difficult decision for me, as I cannot say enough wonderful things about Contiki, from our staff, our product, our partners and the future of this company," he wrote. (JM)