The birdwatching is excellent. Insects and spiders are also abundant and eye-catching. No doubt there are many hard to see mammals up there in the forest, but the slopes are very steep!
Some parts of the area have some level of protection via a "Regional natural park" designation but there are some ideas to develop an "Ecopark" here (Ecoparque Cerro del Santísimo), something like Panachi. I'm not sure I like the proposed idea of a cable-car and any associated tourism development.
Yellow-faced Grassquit (Tiaris olivaceus).
There is a lot else to see such as Yellow-bellied Seedeater, Black and White Seedeater, Yellow-bellied Siskin and many colorful tanagers including at least Blue and Grey, Palm, Scrub, Crimson-backed, Lemon-rumped, Bay-headed, Golden, Golden-naped, Black-capped and Blue-necked. No doubt there are quite a few more tanagers there I haven't seen yet.
More trips soon....