Diego picked me up at my hotel at 5:30AMnd we birded until about 230PM. He was very knowledgable, had a scope and spoke excellent english. We saw over 100 species (remember in June there are no N. American/Texan migrants to pad the day list--so very high percentage of lifers) without driving all over including many spectacularly colorful birds. He knew the sounds too which is a equirment in the jungle. Diego was also a nice person to spend a day with. He really knew the spots and species in Arenal as he only lives minutes away. His fee was reasonable and he responded promptly to email from the USA.