We camped in Koke'e State Park for three nights during our week-long stay on Kaua'i and it was great. The views as you drive up and down the winding road leading up to the park are incredible and it is well worth stopping at all the scenic pull-off spots. We never watched the sunset over the canyon, but we did see the sunrise and that was gorgeous!
Camping was a great way to save money while having a wonderful vacation on Kaua'i!
One really big piece of advice: pack warm clothes or blankets. We had been checking weather.com and it kept saying it would be between 70 and 80 degrees, but it got down to the 50s at night and we really appreciated the extra layers of clothes and towels.
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