We recommend that you fly into Liberia, and book a shuttle through Blue Spirit, which costs $60 (not included in your retreat tuition): http://www.bluespiritcostarica.com/shuttle-reservations
No - you will need to book a room nearby and arrive at Blue Spirit on the 25th.
It starts with dinner at 6pm on the first day of the retreat - we recommend that you arrive at Blue Spirit around 4pm to have time to settle in before dinner. Dedication ceremony ends at 9am on the last day.
We're happy to help! Email us at firstname.lastname@example.org.