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A block north of the Central Park is the Juan Santamaría Museum, which shows some era pieces explaining the legacy of Juan Santamaría and the 1856 campaign against the filibuster invaders led by U.S. Southerner William Walker, who finagled their way into the Nicaraguan presidency and wanted to take control of Central America.
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Alajuela's Central Cathedral is the very center of the town as is traditional in colonial Spanish urban planning. The church is pretty, but not a spectacular piece of architecture. In front of the cathedral is the central park which is a nice spot for people-watching and you may get a glimpse of wildlife such as parrots and a sloth that is an elusive resident.
Alajuela is the hometown to Juan Santamaría, the Costa Rican National Hero. Around the city you can see the location of his home, although now there is just a small plaque and garden as the house in long gone. A block south of the Central Park is the Juan Santamaría park with a statue of the hero and a small collection of 1860s-era cannons.
Five blocks east of the Central Cathedral, this landmark church has an ornate Baroque style, even though it was built in 1941.