That neighbor you don't like? Water his flowerbed and fertilize at the same time!
Kidding of course. Many campgrounds will have a sewer hookup at each site, I go ahead and hook the sewer hose up during setup, but leave the dump valves closed until they are at least 2/3 full so they get a good purge when they dump, plus having lots of liquid in the black tank prevents a "Monument" from forming under the toilet.
If they don't, as in most state parks, then there's usually a dump station on the way out. Black, galley, gray is the accepted order, dirtiest to cleanest. Rinse the sewer hose with fresh water afterwards. When I drop the gray tanks, I go inside and run about five gallons of water into my black tank then toss in the treatment. I'm looking at going with the GEO method when I run out of chemicals. Just google RV GEO method.
If there's not a dump to be had, Flying J truck stops usually have an RV dump, several state rest stops do, and if you run across a campground many of those will allow you to dump for a fee. Flying J charges also, but from what I've seen they're cheaper than most campgrounds.
Lastly, if you have a septic tank at home I know of a couple of folks that will just drop it down the cleanout access, but I don't know if it's good for the system, the drain field, what the local authorities would say, etc.
Now-2014 Sierra 346RETS 5er BUB
Then-2002 Keystone Springdale 286RLDS TT
Nights camped in 2014-28, 2015-127, 2016-10