Plains of the North
The North Zone is known for Arenal Volcano, but it has other gems that are not-so-hidden such as Lake Arenal and the Los Angeles Cloud Forest.
Arenal is the world's 3rd most active volcano and can be heard rumbling several times an hour. The lava flow changes frequently, but even without seeing the lava the mountain is impressive in size and shape.
The Los Angeles Cloud Forest is not as visited as the Cloud Forests in Monteverde, but the wildlife is abundant and the locals are extremely friendly.
San Ramon is a moderately sized town that really only has one tourist attraction, the local church or cathedral. The church is large and in a state of repair but it is next to the town's central park which follows Japanese influence in its design. The north-eastern parts of this region are dominated by monocultural axploitation of sugar cane, citrus trees and pineaple farms.
To the locals. Find a good soda to frequent and meet the local Ticos or Ticas to better enjoy the region.
The best way to get to the North Zone is by car. There are also local buses that travel San Jose and San Ramon, but the car offers the most flexibility to stop and experience the local culture on your trip to the North.