Aruba is 6.3 times larger than Caguas, Puerto Rico.
Area: 180 km2 World Factbook
Population: 110,663 (July 2014) World Factbook
Aruba is an island 33 kilometres long; it is located about 1,600 kilometres west of the Lesser Antilles in the southern Caribbean Sea and 27 kilometres north of the coast of Venezuela. Together with Bonaire and Curaçao, it forms a group referred to as the ABC islands. Wikipedia
Area: 29 km2 calculated
Caguas, founded in 1775, is a city and municipality of Puerto Rico located in the Central Mountain Range of Puerto Rico, south of San Juan and Trujillo Alto, west of Gurabo and San Lorenzo, east of Aguas Buenas, Cidra, and Cayey. Caguas is located 20 miles from San Juan and 40 miles from Ponce. Wikipedia