Here's the short answer: you can either get a one-day ticket for Volcano Bay only, or purchase a multi-day ticket that includes both other parks.
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It's Simple to Hop into the Virtual Line™.Here's how to get in the ride lines at Volcano Bay: Tap in at an attraction with your TapuTapu™ wearable and you're in the Virtual Line™ experience. You're free to explore the park while your TapuTapu™ wearable counts down the minutes to your return time.
All bags, backpacks, purses, packages and items are subject to X-ray and/or additional inspection prior to entering CityWalk or the Theme Park(s). Suitcases and bags with wheels are prohibited. We recommend you leave unnecessary articles in your car and secure valuables in your trunk.
TapuTapu is included with your Volcano Bay admission. As you enter the gates of the water park, you'll receive the wristband device. However, it should be noted that, unlike Disney's MagicBand, you will have to surrender your TapuTapu when you leave Volcano Bay for the day.
Make sure you've got strong swimmers if you plan to do the Ohno and Ohyah drop slides. These two body slides plunge into a 10-foot-deep pool! Volcano Bay does not provide any free towels, so be sure to bring your own if you do not want to rent them (it costs $7).
Express Pass at VB is VITAL on busy days. I rarely buy UXP for the other parks, but it's a must there. If you've never been or used the Tapu Tapu system it's great, but on very busy days it can't handle the crowds. Buying UXP eliminates that.
Is the water heated at Volcano Bay? Yes, of course! Almost every water slide, pool, and lazy (or not-so-lazy) river is fully heated to at least 80 degrees, which is what allows the water park to remain open almost every day of the year.
You are not allowed to bring in coolers, but you can bring in water bottles and food in plastic containers (no glass) if you have a food allergy. While the TapuTapu will help reduce the amount of time you spend in line, don't expect no lines.
From their website: Lockers can be found in all three sections of Universal's Volcano Bay™. There are three different locker sizes available: mini, regular, and family ($8, $12 and $15 respectively). Helpful?