The Sign itself is at the top of a long trail, which is also at the top of a slow busy drive and more walking. Nothing much around. So prepare as if going on a short hike. Water, snacks, ect. If you want to just see the sign I'd suggest picking a lower vantage point/cross street and get your pictures. Otherwise it's a half day at least when its busy.
No food around here. Carry your own snacks
There are no convenience store locally around this hike. So make sure you pack your own food and drink.
No food next to the sign but I believe there is a coffee place next to the Griffith observatory that's like 2miles hike to the sign
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