I'm notorious for taking countless candid photos of my friends and family, along with asking for frequent, time consuming stops at various lookouts on a drive. Worse, I post very few images and never quickly enough for everyone. My reasoning is that I shoot exclusively RAW stills and log style video which requires at least some post processing, but most people don't understand this. Here are some tips I've learned to stay on amicable terms with everyone:
1. Use the electronic shutter
I'm a big fan of having a quiet shutter option for intimate church scenes, well-mannered award ceremonies, and nondescript wildlife (or people!) photography. If you own a camera that has this functionality, make it easily accessible because chances are no one will even realized you snapped their picture if you do. Some of the best candid shots come from accidental pictures, but imagine never having to bump your camera's shutter button with your elbow to capture a hilariously compromising expression ever again. "Oops that was an accident!" is a lot more difficult than "What picture? I didn't take anything." (Don't forget to turn off the electronic shutter sound though!)
2. Propose a scenic sunset location for the "romance"
Take your darling on a picturesque drive to a secluded beach locale. Your hands brush lightly as you move the car's shifter into park. After walking down a short path to the shore, turn to your significant other and, when you should be handing them a glass of champagne, instead say "Hey, can you hold this for me? I need to change lenses for this one." They will mutter, aggrieved, under their breath as they hold your massive Sigma 200-500mm f/2.8, but if you capture a good enough image all will be forgiven. Probably. Depending on how many mosquitoes there are.
3. Convince the driver to take an accidental detour
We can't always be in control of the vehicle but every photographer knows the best camera is the one you have with you. If your detour becomes remote enough, your camera phone also doubles as a rudimentary distance indicator that lets you know how far the walk back to civilization will be if the car breaks down. And don't forget, if you see that decisive photo opportunity, just say you have to get out to pee. That should give you a convenient few minutes to frame your shot - just don't let anyone think you're taking a picture of your junk.
4. Take everyone to a fancy downtown dinner reservation
No one can possibly fault you for taking your time photographing the quaint city center when you arrive an hour prior to your reservation and they can't seat you early. If you really want to make it worthwhile, pay for the meals too. Hopefully your relatives are too polite to say they have to go to sleep for work the next day, and you'll be free to take as many evening street scenes as you'd like.
5. Actually publish your photos online somewhere
And most importantly, in an appropriate time frame. I'm probably the worst at this, sometimes taking a full year or more to finally choose which photos I want to post online. They say a good photographer only shows their best work, but sometimes we just have to appease the masses and get some snapshots out there. Otherwise your audience never sees results, and they will grow increasingly short when inconveniencing them for photos. If you lead everyone on long enough though, you do get to bask in the shade thrown when you do finally post something in a timely manner. Ultimately, I like to think everyone is happy to have some memories look at, even if they are a little late.