Hi OP
I am a very keen hiker, I have visited both Death Valley and Yosemite…. And Vegas
If neither you nor your friend are ‘hikers’ then I think being realistic and visiting for a walk to see the highlights is probably what he means. You’ll need to ask him.
To give you an idea…
I spent a week in Yosemite on trails last October. 3L water minimum a day. More back in the car. Food with enough calories for the hike day + a day. Getting lost is a genuine risk. The trails are well marked, but this isn’t the lake district there are vast areas where you will see noone. There are also bears, you cannot leave food in your car, there are lockers. Warm and waterproof clothing. You’ll also need a map and know how to use it. I suggest you stick to the Yosemite Valley area. There are tonnes of view points from the car parks, 100m walk max. for most. Trainers will be fine, the paths are concrete and well maintained. Wear whatever you like, although jeans are probably a bit warm. You will still need to bring a lot of water and food as although there are some cafe’s they’re sparse.
We have all the necessary clothing, weather gear, footwear, the lot.
We did drive through death valley as we had also hiked around Utah and Arizona. If you’re driving Las Vegas to Yosemite via Death Valley I recommend a stop at Stove Pipe Wells, there is a cafe and fuel station. There are other fuel stops but that route has more passing traffic. We walked about 10meters up the dunes there and took some pictures, I wore a skirt and Birkenstocks.
I cannot imagine anyone really ‘hiking’ in Death Valley, especially in October. That 10-15mins I spent outside the air con of the car was enough. I could feel my eyes drying!! Doing things for fun is my priority on holiday and as a big hiking fan, I think accepting it’s called Death Valley for a reason is sensible.
If you were to walk any distance I am not sure what you would see, it’s a dessert, also very difficult to walk on sand, the view from the road allows you to see a fair distance so a few stops to take pictures is a more realistic plan. That route on a clear day will also offer a view over chloride city and the borax works.
Have fun!