Sol Cabanas del Caribe (p. 135) is closed. It got pretty battered by Hurricane Wilma, apparently, and since it was an older resort, it probably wasn’t worth fixing up.
Palapas Amaranto (p. 134) has a new website, www.tamarindoamaranto.com, which also gets you info for Tamarindo B&B (p. 135), under the same ownership. (And to clarify, at Tamarindo, all guests have access to the kitchen, not just two of the rooms.)
Additionally, you can now contact each place via the following mobile phone numbers:
01-987/800-5571 (in Mexico)
+44-987/800-5571 (from outside the country)
01-987/112-4111 (in Mexico)
+44-987/112-4111 (from outside)
Because Amaranto is unhosted (meaning there isn’t someone there around the clock), you should call before you arrive, to make sure someone is there to meet you with keys.