A day spent on Hawaii’s shores is bound to be loads of fun, but a great day at the beach can turn sour if you’re stung by a jellyfish. Fortunately, there are plenty of things you can do to prevent a jelly encounter.

The jellyfish that live┬ánear Hawaii are usually far enough away from shore that they’re not a problem for swimmers. Once a month or so, however, some parts of the islands get an influx of jellyfish. Always swim on guarded beaches, and ask the lifeguards about current jellyfish levels. You can also find arrival calendars online.

Of course, any swim in the ocean comes with a slight risk of encountering a jelly. If you’re stung, rinse the area with salt water and vinegar, then ice the sting to reduce swelling. You’ll be up and ready to jump back into the water in no time!