To stay in Mexico you'd go through the Interval International Exchange (The World Passport Collection):
World International Vacation Club - Mar Azul • MZL
Acapulco, Guerrero, Mexico
Club Internacional de Cancún • VCI
Cancún, Quintana Roo, Mexico
The
Royal Caribbean • RCB
Cancún, Quintana Roo, Mexico
The Royal Islander • ROI
Cancún, Quintana Roo, Mexico
The Royal Mayan • RMB
Cancún, Quintana Roo, Mexico
The Royal Sands • RSD
Cancún, Quintana Roo, Mexico
Palma Real Hotel and Villas • PLR
Manzanillo, Colima, Mexico
El Moro Tower El Cid at Mazatlán • MO1
Mazatlán, Sinaloa, Mexico
Marina El Cid Hotel & Yacht Club • ME1
Mazatlán, Sinaloa, Mexico
Vacation Internationale - Torres Mazatlán • TMZ
Mazatlán, Sinaloa, Mexico
World International Vacation Club - La Paloma and WorldMark La Paloma • LPA
Rosarito Beach, Baja California Norte, Mexico
Lindo Mar Adventure Club • LMA
Puerto Vallarta, Jalisco, Mexico
Paradise Village Beach Resort & Spa and Paradise Village Marine Residence • PRV
Nuevo Vallarta, Nayarit, Mexico
Playa del Sol Costa Sur • CVV & CVA
Puerto Vallarta, Jalisco, Mexico
Playa del Sol Grand • PYL
Nuevo Vallarta, Nayarit, Mexico
Rancho Banderas Vacation Villas • RHB
Punta Mita, Nayarit, Mexico
Villa del Palmar Flamingos • VDF
Nuevo Vallarta, Nayarit, Mexico
World International Vacation Club - Conchas Chinas • CNS
Puerto Vallarta, Jalisco, Mexico
Premiere Vacation Club at Sea of Cortez Beach Club • SRL
San Carlos, Nuevo Guaymas, Sonora, Mexico
Cabo San Lucas Beach and Tennis Club • CBO
Cabo San Lucas, Baja California Sur, Mexico
Club Casa Dorada Spa and Golf Resort • DOR
San José del Cabo, Baja California Sur, Mexico
Villa del Palmar-Cabo • VDC
Cabo San Lucas, Baja California Sur, Mexico
WorldMark Coral Baja • WCB
San José del Cabo, Baja California Sur, Mexico