The Crater Rim drive at HNVP is a must do. Again- if you are doing HNVP- you really need at LEAST 2 days to do all the major sites. The Crater Rim drive is easy to get to - just follow the well marked signs. Along the way you will pass many craters from earlier eruptions- there are pull outs that allow you to easily explore these. ALong this road is the access to the Petroglyphs. The petroglys are about a 30 min. hike over lava - sneakers recommended! Lava can be sharp and full of crevices that can easily cut or turn an ankle. The fields are surrounded by a boardwalk, but look carefully and you will see glyphs in lots of places. There is no shade here as it is right smack dab in the middle of a lava field- so bring some water. The Sea Hole Arch is awesome at the end of the road. Take some time to walk down the paved road where the lava has crossed. Scramble about 1/2 way over the flow and take the iconic picture of the road sign buried in lave: Road Closed. This is about a 25 mile drive along twisty roads so you need to allow about 2-3 hours or more depending on how much you explore the area. At the Sea Hole Arch there are port-a-potties and a snack shack.
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