Some of this is a function of our times. It's harder for your kids, perhaps, to find kids in the neighborhood if a) there aren't a lot or b) those kids are in programs.
But there's a bigger problem, which is that kids don't know how to entertain themselves, engage in imaginative activities, or even get along with each other and have fun with someone of a different age (like each other). You're not alone in that area, but it's an area where you can fight things a bit.
The other thing is, they don't respect your work or the helper (or the money at stake here), and they think it's your job to entertain them, at least by giving them unfettered access to electronics. You don't say how old they are, but one thing that happens as they approach the tween years (and certainly teen years) is that they start to assert their natural independence even before they are ready to fully exercise it or understand how to make decisions in connection with it.
My suggestion is that you google things like "Job Jars" and "Kids' Chore Sticks" - these are papers or (better because they can be used over and over) large tongue depressor/craft sticks on which you write a job and a rewards that comes with it. So cleaning a bathroom or picking up a room or sorting laundry/putting it away all come with a "denomination". Instead of money, it can be X minutes on the video games or Y minutes for a ride to a friend's house or a playdate. There are also photos you can see about a Lost & Found bin where Mom/Dad pitch the stuff left lying around, and the kid has to pick a chore from those selected/on display on the outside of the bin before they can have the item back. That gets them to think ahead about putting things away and how valuable (or not) their items are.
You can also get some great (sometimes older) books in the library of summer activities and camp activities, so kids can create their own fun with little help. Science experiments (within reason), ant farms, and some of the "old fashioned" games are actually totally absorbing for kids if they are nudged into it. This is unscheduled fun, unscheduled activities, and really awesome for creative thinking (which involves learning without knowing they're doing it).
In general, I think parents have to remember they are in charge, find a way to control the arguing by making it way more unpleasant for the child when he/she fights back (especially disrespectfully or with a martyr complex, vs. a reasoned argument). Getting control of this before they hit their teens is really important when they become more rebellious and wanting to do stuff alone, and certainly when they want to get a learner's permit!
Bottom line - don't let them make you crazy. You have to be in charge and not give in to the nagging, which is basically a tantrum for kids older than 6! If you make it worse for them when they behave this way, and if you absolutely never give in because they annoyed you and it felt easier to "cave", it will be better in the long run. Sure, you can let them slack in the short run, but what will you do in September or next summer? It actually gets harder the older they get.