The crew of four decided to go to the Palaki ruins and petroglyphs today. Reservations are required for this excursion, but it is well-worth the trouble. Make sure though, that you plan in advance if you want to go as their last tour was at 2:45pm, if I remember correctly.
We also went to the cactus garden/shop today. I learned that there are birds that create their nests in cacti! I had no idea!