At night you can go to bars or restaurants on the beach with your friends and experience the chill ambience. Weekends are the time most bars are busy with customers and sometimes they hold parties. I suggest staying at San Juan, La Union for minimum 2 days specially if you go there alone. Why? First, It’s easy to interact with locals and get new friends. They are very friendly and won’t hesitate to invite you for a party at the beach or bars. Second, try other activities such as hike along the Arosip Eco Trail in Bacnotan. There are waterfalls, Balay Anito Falls in the town of Santol, and Lon-Oy Springs in Barangay Lon-Oy and Bayabas in San Gabriel. For now in the low season, what you can do are paddle boarding, snorkeling, enjoy sunbathing under the blazing sun, and party at bars on the weekends.