Sure, I'd be happy to help you plan your one-day itinerary in Shanghai! Here's a suggested itinerary that will allow you to experience some of the city's most popular attractions and landmarks:

Morning: Start your day with a visit to the iconic Bund. This waterfront promenade offers stunning views of the city skyline and is home to many historic buildings that reflect Shanghai's colonial past. Take a leisurely stroll along the Bund and snap some photos of the impressive architecture.

Afternoon: Next, head over to the Yu Garden, a beautiful classical Chinese garden located in the heart of the old city. The garden features traditional pavilions, rock formations, and water features, making it a peaceful oasis in the midst of the bustling city. After exploring the garden, take a walk through the nearby bazaar, where you can find all sorts of souvenirs and local snacks.

Evening: In the evening, make your way to the French Concession, a charming neighborhood known for its tree-lined streets, trendy cafes, and boutique shops. Enjoy a leisurely dinner at one of the area's many restaurants, then take a stroll through the picturesque streets and soak up the atmosphere.

If you have time, you may also want to consider visiting some other popular attractions such as the Shanghai Tower, the Oriental Pearl TV Tower, or the Shanghai Museum. However, keep in mind that these attractions can be quite busy and may require more time than you have available for a one-day itinerary.

Overall, this itinerary should give you a taste of some of the best that Shanghai has to offer, from its historic landmarks to its modern urban vibe. Have a great trip!