Re: [EagerDave] Lauterbrunnen
valley hostel is cool but gets booked up fast as well.. there is no specific packing area but you can use their back patio i believe.. they had a tarp out last i recall. four jumpers may be pushing it though.
camping jungfrau does NOT cater to base jumpers. you may sneak in if you avoid disclosing that is your purpose of the visit, but they have just had too many assholes stay with them and they are fed up with it.
if you dont mind spending cash you will find a spot.. lots of hotels in the valley. doing it on the cheap is what books up quick.
renting a camper/rv and sleeping in it is common, but then you have to worry about paying for parking overnight on top of rental fees. poor examples of people are getting busted circumventing the parking gates/charges at Stechelberg's parking lot also.. dont be one of these.
alternatively but not as conveniently you can check Wengen and Murren of course.