The optimal solution for creating interactive data visualizations and dashboards from multiple data sources is Amazon QuickSight. It offers fast, cloud-powered business intelligence services, allowing users to build visualizations, perform ad hoc analysis, and quickly derive insights from their data. Other services mentioned, such as Amazon Athena, AWS Glue, and Amazon Kinesis, serve different parts of the data processing workflow. Amazon Athena is used for running SQL queries on data in S3, AWS Glue is for data preparation and loading, and Amazon Kinesis handles real-time data streaming but none of these services are primarily focused on data visualization like QuickSight.