This chapter deconstructs the structural components of tourism seasons, identifying the internal mechanics of troughs, shoulders, and peaks. These elements define the rhythm of tourism recurrences and determine fluctuations in business performance and workforce stability. While seasonality is repetitive, historical evidence from New Zealand demonstrates that it is also adaptive and subject to structural shifts over time. The chapter introduces mathematical characterizations to quantify intensity and duration, acknowledging that no two seasons are perfectly identical due to inherent variability. Specialized geometric techniques, such as the Shoulder Pythagorean Measure (SPM) and the Shoulder Intensity Measure (SIM), are developed to analyze the gradual buildup and decline of demand during transitional phases. Economic analysis reveals that these seasonal segments significantly influence business profitability, price elasticity, and labor market dynamics. Furthermore, the chapter contrasts constrained and unconstrained infrastructure models, highlighting the trade-offs between excess capacity and peak-season overcrowding. Integrating these multi-faceted considerations into strategic planning allows destinations to mitigate negative effects and enhance long-term economic efficiency and industry sustainability. By providing a detailed anatomical view, the chapter offers a framework for moving from reactive management to proactive destination orchestration.