Paul, Carol and I visited the Nature Preserve just outside of Panajachel, yesterday. (Jim was a little indisposed, but okay today.) We rode in a Tuk Tuk and there was plenty of room for 3; however the motorcycle motor had difficulty on the hills. On the last one, on a curve, we had to get out and walk for about 25 feet. Then the side road was downhill, so able to ride again.
It was about $7 USD entrance fee for the nature trails and a butterfly garden. The jungle foliage was lush and there were several swinging bridges, some very long. We also saw waterfalls and cascades and many birds; but no monkeys. The butterfly enclosure had many butterflies, most were of the same variety; black with dots of color, not sure of the name. I took many photos, but since they were constantly moving, only a few were good.