What are the necessary items for traveling when I go out with my boyfriend for 4 days on May Day?

According to the text you provided, your question is about the advice of the necessary items for travel. The following is a list of some travel necessities that may be useful:

1. Mobile phone and charger: Make sure the mobile phone is fully charged and bring a spare charger to keep in touch during the trip in case of emergency.

2. Travel documents and cash: bring your ID card, passport, travel insurance, reservation voucher and cash in case of emergency.

3. Clothes and shoes: Bring appropriate clothes and shoes according to the planned places and types of activities.

4. Cosmetics and personal hygiene products: bring necessities, such as toothbrushes, toothpaste, towels, sanitary napkins, etc.

5. Sunglasses, hats and sunscreen: In order to protect the skin and eyes, bring appropriate sunscreen products and sunglasses.

6. Camera and battery: record the wonderful moments during the trip, bring a camera and spare batteries.

7. Medicines and first aid kit: Take necessary medicines and first aid kits in case of emergency.

8. Kettle and water: Bring a kettle and enough water to replenish water at any time during the trip.

9. Maps and navigation equipment: Bring maps and navigation equipment to conduct directional navigation near the destination.

10. Other necessities: such as umbrella, inflatable pillow, eye mask, etc. Take other necessities according to your own needs and preferences.

I hope these suggestions can help you prepare for your trip and have a good time!