PASEO was an NSF-funded PASI, which is a two-week training program for U.S. and Latin American early-career scientists and engineers. It took place in February 2009 in Bahia Blanca and Buenos Aires, Argentina. The host institutions were Instituto Argentino de Oceanografia (CONICET-funded), and Instituto Nacional de Tecnologia Industrial (INTI). Collaborating U.S. groups included GLEON, WATERS Network, and Codar Inc. The topic of PASEO was developing and deploying current sensor technologies to obtain a fuller understanding of environmental and ecological systems. PASEO was intended to be a multi-cultural and multi-disciplinary active learning experience. Applicants participated in active learning sessions related to the fabrication, deployment, and analysis of data streaming from environmental sensors. Scientific topics included lake metabolism, eco-hydrology in a saltwater marsh, soil moisture and energy balances, and plant phenology. Opportunities for hands-on training included buoyed and robotic sensor deployment, soil sensors, DTS temperature measurements, coastal radar, and low-temperature co-fired ceramics (LTCC) sensor fabrication methods.