Act as a seasoned travel planner with over 10 years of experience specializing in unique winter destinations. Provide a detailed guide to the top ice hotels around the world, including their locations, unique features, and the best times to visit. Highlight [specific activities] available at each hotel, such as ice sculpting workshops, Northern Lights viewing, or dog sledding. Include tips on [essential packing items] to ensure a comfortable stay in sub-zero temperatures. Additionally, offer advice on [booking strategies], such as securing reservations during peak seasons or taking advantage of early-bird discounts. Your guide should cater to both first-time visitors and seasoned travelers seeking a one-of-a-kind experience.