I have to cast my vote with Option 2: Las Galeras.
Las Terrenas is fine if you stay there. It is not a center for touring the peninsula. Is it worth visiting? By all means, spend a night there.
The advantage of Las Galeras is that it is a small and fairly quiet community, but close to Samaná and Playa Rincón...and You can tour the falls a El Limón from there as well as from anywhere.
Do yourself a favor and make Option 2 your plan for those great days.
HB
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