Toilet facilities at state / national parks lack in privacy but are generally clean and efficient. They'll have to walk from their tent site to the bathroom area, so a bucket for toiletries is practical. Occasionally toilet paper is lacking, so it's a good idea to always keep one roll in your own car. These facilities often have laundry facilities adjacent.
They definitely need the America the Beautiful Pass, which is expensive but grants free admission to national parks for one year. They should buy it at the very first national park they visit -- not ahead of time. Why? Because the 12-months starts ticking off when it's purchased, not from its first use.
Established campsites typically come with a picnic table, a laid-out tent spot, and a metal-ringed fire spot. So the table and chairs aren't a necessity. I like it when a campsite has a lantern hook so you can keep your lantern up high instead of placing it on the table.
Camping in national parks (and don't overlook state parks) isn't particularly cheap. We did a driving trip of the Western National Parks a couple years ago, and we started out with the idea of camping. However, by the time we were done, we discovered that we could do better in hotels. Why? Largely because we could find hotels for $35-50 on Priceline, and by bidding carefully we almost always got a free breakfast with that. Also, my husband had built up a large number of "points" for various hotels through business travel, and we cashed those all in. If we'd camped -- we're a family of four, so their details will differ -- we'd have needed to take our older, larger, less fuel-efficient car (how else could we carry a tent, four sleeping pads, four sleeping bags, a cooler, and our clothes?). Using hotels allowed us each to travel with one small bag. We didn't have to carry/launder our own linens, and that alone was a huge space savings. Don't forget that camping means buying firewood and/or propane for the stove . . . and ice for the cooler; add that to a $15-20 per night campsite fee, and you've reached the cost of a low-end hotel room . . . but you're not getting the free breakfast. Traveling without camping gear allowed us to use a 40 MPG car.
Of course, their details may vary. They may be looking for camping as the experience, not a vehicle for inexpensive travel. But be sure they've counted in all the little costs of camping.
And finally, how old are they? I'm surprised they aren't planning these details themselves.
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