The couple that decided love can really work the 11th time around went "camping" near the beach in Santa Cruz, CA ... in an uber-luxury RV at the upscale KOA Kampgrounds.
The kids had a chaperone of sorts ... Justin's dad, with bodyguards in tow.
The price was sure right to park the Prevost RV -- $65 a night. BTW ... the RV -- which retails for anywhere between $1.5 - $2.5 mil -- is owned by Chris Brown and it has a big master bedroom, a kitchen, living room and, of course, lots of video games.
JB and Selena spent the day jumping on the camp's trampoline and tooling around on Segways ... in other words, their feet never touched dirt.
Best part ... after they left campers found pieces of Segways.
At least they didn't go off the cliff.