From San Jose, or any other major city, take a Tracopa bus to the city of Palmar Norte. (Note: there is one bus daily directly to Sierpe that leaves San Jose at 8:30am). This bus will cost you $11-$15 USD. See Tracopa’s website for bus times, more information, and exact pricing:
Once you get off the Tracopa bus in Palmar Norte, you’ll need to go to the Sierpe bus stop. From the main Palmar Norte bus station you were dropped off at, walk into town, to the left if you’re facing the bus station’s ticketing counter and wait area. After having walked about 50 meters, take your first right onto a large street. After about 25 meters, you’ll see a long metal bench with a roof over it on the left side of the road. This is the Sierpe bus stop. If you have any trouble finding it, ask a local, they’re always friendly and willing to help. The bus will cost about $0.75 USD. Once on the bus, get off at the last bus stop and you’ll be at the Sierpe park, right in the middle of town!
Alternatively, you can take a taxi from Palmar Norte to Sierpe. This will cost you between $15-$20 USD.
Bus times from Palmar Norte to Sierpe: 5:00am, 6:30am, 8:00am, 9:30am, 11:30am, 2:30pm, 5:15pm.
Bus times from Sierpe to Palmar Norte: 5:30am, 7:15am, 9:00am, 10:30am, 1:30pm, 4:00pm, 6:00pm.