This summer I am going off to camp for the sixth time in the summer and I need to know what would be good to bring a long. Yes, clothing, shoes, all of those I already know of course. I mean extra items. We will be doing tubing, water skiing, and mountain biking. Those are hints for things I might need. I am already bringing my bike and helmet/padding, so no need to say that since I already covered it. And I know to bring a swimsuit. If you could mention some things that aren’t as obvious. Thanks, I appreciate it 
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Since it appears you might be doing a lot of stuff in the water, I’d say that if you weren’t planning on bringing water shoes, that it might be something to consider. Also, definitely bring a life jacket for sure. And the last two things that I’d say is that you might want to search out a helmet that could be used for both mountain biking and water sports. That way you’ll have protection for both activities, but not have to bring one for each. Lastly, a hydration backpack. It’s small, lightweight, and would be super helpful on a hot summer mountain bike ride.