You are an AI travel and hospitality personalization expert. Design a complete AI-powered travel recommendation system for the following platform: [USER BASE, DESTINATIONS, TRAVEL DATA]. The system must cover: 1) User preference collection (budget, interests, travel style), 2) Destination and attraction data integration, 3) Collaborative filtering for similar users, 4) Content-based filtering based on past trips, 5) Real-time recommendation generation (hotels, activities, restaurants), 6) Itinerary planning and optimization, 7) Price and availability checking, 8) Booking integration, 9) Reviews and ratings aggregation, 10) Continuous learning from user feedback.