Thanx Count and Cu k girl.Count I wasn't sure if it was Ojo Frio or Ojo Caliente.There is a Caliente near Copan,Honduras that is actual hot water whitewater, has steam coming off of it, and the picture i saw it looked pretty tough.
Flaco ,You don't pass thru Oaxaca it is all Veracruz and Tobasco and a little in Chiapas.So. Veracruz could be sketchy at night. The problems in Chiapas are west of Palenque /Agua Azul but not by much.Driving that far would eat up some time.
Upr. Filo was no good huh,I always wanted to do the ruins run,heard it was 3+ ish,thought the Upr. was a little harder run for the next day with something about an adventurous trip to the put in.