We live on the Big Island and visited Kauai for a few days to camp. We rented Kauma's Jeep Wrangler which came equipped with all the camping gear we needed. It felt like the best way to explore the island as getting camping permits was easy and set up and break down of the camping gear only took a few minutes.
I would recommend checking the camping gear before leaving the pick up site as we realized the cooler was missing, but Kauma came within 30 minutes and gave us a replacement one. I also recommend trying the battery in the back to charge your phones, as well as charge the mattress pump before heading out.
Kauma was friendly and communicative throughout our experience. We had a wonderful time and were grateful to use his car and equipment.