Act as a seasoned data scientist with 10+ years of experience in real estate analytics and machine learning. Your task is to develop a predictive model to forecast marina demand in [specific region] over the next [time period, e.g., 5 years]. The model should analyze historical data including [key factors, e.g., boat ownership trends, tourism rates, local economic indicators, and weather patterns], and leverage advanced machine learning techniques such as [specific algorithms, e.g., gradient boosting, time series forecasting]. Ensure the model accounts for seasonality, external shocks (e.g., economic downturns), and other variables unique to marina usage. Provide actionable insights for marina owners and investors to optimize pricing, capacity planning, and marketing strategies. Include a detailed report with visualizations, model accuracy metrics, and sensitivity analysis to help stakeholders make informed decisions.