A comprehensive review of firsthand traveler experiences was conducted to create a guide for a relaxing cruise on the Osaka Aqua-Liner. However, after a thorough search of the provided notes, no specific mentions, descriptions, or reviews of the 'Osaka Aqua-Liner' were found. The traveler accounts, while rich with details on many of Osaka's attractions, do not contain any information about this particular river cruise service.
Therefore, in adherence to the rule of using only the provided information, a detailed guide to the Osaka Aqua-Liner cannot be created. Instead, this guide will pivot to explore other river and canal-based experiences in Osaka that were highlighted by travelers, offering an alternative glimpse into the city's life on the water.