Hi Abby! No need to fear, your Jambox is not broken and can be easily repaired. Because your device will not turn on, this leads me to believe me that you have either a battery or charger problem. First, try your chargers again. Charging via MicroUSB should take 2.5 hours, and 5-6 hours via wall charger. Charging is taking longer, your charger may be the problem and you will need to purchase a new charger.
If you have found that your chargers are not the source of the problem, you will need to take out the current battery and replace it with a new one. iFixit has a very useful guide on how to do this, found on the [[Jawbone's Big Jambox Speaker Troubleshooting|Big Jambox troubleshooting guide]] under “Jambox not fully charging”.
Hope this help, good luck and have fun at the beach!