If you're driving, pay careful attention to any posted hours. If you are on foot and can access the sand without going through a beach park, you can enjoy the beach at all hours on a Hawaii vacation.
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You need to use common sense and watch for pickpockets and so on, but honestly, we'd go walking at 2am and absolutely no problems. Do keep in mind that you may get rather seedy characters in Waikiki, but they aren't known to bother people.
Night surfing in Waikiki is no great secret. When the waves are good and the night sky is clear, and particularly when the moon is brightest, there will always be a group of surfers in the water after sundown and well into the night. But it's a fraction of the daytime crowd, and one that is categorically friendly.
It's a safe bet there are no lifeguards on duty. Night swimmers are frequently intoxicated. One of my classmates from high school perished in a dark ocean. Play it safe, never swim alone.
Most people change into dressy casual attire in the evening, which is slightly dressier than their daytime attire. You'll find a wide array of fancy resorts and many famous restaurants in Hawaii. Therefore, if you want to spend a beautiful night out, you'll have plenty of venues where you can dress up.
Lydgate Beach Park in Lihue is Hawaii's safest beach because of its contained swimming area by a jetty and watchful lifeguards. Due to its shallow and unpolluted seas and the jetty's protection from heavy waves and rip currents, Lydgate Beach Park is one of Hawaii's best toddler-friendly beaches.
Hawaii has semi-tropical weather. Temperatures usually range from 75-90 degrees year round in the daytime, and 70-80 degrees at night. Temperatures in the winter months may be a little cooler, where nighttime temperatures can sometimes fall into the 50's.
On the other end of the spectrum are two counties in Hawaii — Maui and Kauai — where people go to sleep, on average, around 10:30 p.m., the earliest in the country. The latest to bed aren't, naturally, the earliest to rise.
Purple flags indicate the presence of dangerous marine life like jellyfish or sharks. Hawai'i beaches also have signage warning of specific hazards. Always obey No Swimming and No Diving signs. Other signs indicate presence of Dangerous Shorebreaks (where waves break onshore), Strong Current, or High Surf.
No alcohol on the beach whether it's in a glass container or not. If by canopy you mean a tall pop up one that'd be a no. Some people do it on other beaches around the island (and usually back on the grassy areas bordering the beach, not in the sand itself).
The Waikiki Beach Walk is an amazing pathway along the beautiful Waikiki Beach. There are many resorts, eateries and fun things to do along this walk. It is lovely day or night. Very safe to walk in the evening.
Waikiki Beach is especially excellent if you're new to the sport and looking for friendly learning conditions. Like riding a bike or swimming for the first time, proper instruction and a bit of bravery will lead you to success. If your only goal is to stand up on your board, Waikiki waves can be very forgiving.