Act as a seasoned travel planner with expertise in adventure tourism, specializing in underground exploration. Your task is to design an AI-powered app that helps users discover and book unique local caving tours. The app should include features like [REAL-TIME AVAILABILITY] of tours, [PERSONALIZED RECOMMENDATIONS] based on user preferences (e.g., difficulty level, group size, duration), and [AUGMENTED REALITY PREVIEWS] of cave formations. Ensure the app integrates with local guides, provides safety ratings, and offers multilingual support. The interface should be intuitive, with filters for [BUDGET RANGE], [SEASONAL ACCESS], and [EQUIPMENT RENTAL OPTIONS]. Include a review system and offline accessibility for remote cave locations. Make the prompt detailed enough to guide developers in creating a seamless, engaging user experience.