If you decide to stay at a 4-star hotel in Onawa, you'll usually find plenty of amenities to ensure you're relaxed, such as a pool, restaurant and gym. You can look forward to excellent service and deluxe accommodation. Go for a 5-star hotel and you'll have access to a few more perks — think concierge assistance, on-site spas and opulent turndown services. You'll most likely get additional amenities and premium services at a 5-star stay, though both are superb options for luxury guests.