Reddit mentions of SE Prospector Series Green Sand Scoop for Metal Detecting - GP3-SS20

I believe this is a fine detector for your purposes. I've seen better models for rent at the same price, especially if you are planning to use it for only the weekend. You may find a better one to rent for a comparable price. Although there tends to be a bit of a learning curve with higher quality detectors (in my experience) so make sure you get a good class from the dealer before you take it out.

Either way, that model will detect metal, no doubt about it., And with the kids, I would say an equally important part of this adventure is having the right tools. Specifically, a few of these to go around.

I've organized hunts for the little ones before, and I may or may not have seeded the beach with some coins in order to make sure everyone found something when it was their turn! Spend a few dollars and get a few rolls of coin to plant on the beach before the kids get out there. Or even a few Hot Wheels cars for the boys, or cheap accessory jewelry for the little ladies. I know it may not be a genuine experience, but I get the feeling this is more about creating memories. And there's nothing wrong with that. Don't forget the scoops!

Happy Hunting

Buy it off Amazon and have it shipped directly to the hotel- it looks cheap enough to just leave it there when you are done.

My suggestions might be different if you hadn't indicated both low budget and immediate(?) need.

[Sand scoop] (https://www.amazon.com/SE-GP3-SS20-Plastic-Treasure-Hunting/dp/B00KEV2RRY/ref=sr_1_sc_1?ie=UTF8&qid=1468600120&sr=8-1-spell&keywords=snad+scoop)...the heavier/heavier duty ones become less attractive for a number of reasons. This one can be scooped through dry sand and shaken with relative ease. If wet sand...slow way down and place a shovelful into it and shake(not nearly ideal, but gets the job done and stays in budget)

Shovel...lots of options in the $10-$20 range. Check the local hardware store. IMHO, I would avoid wooden handles and def stay away from survival type tool/shovels with threads. Sand/grit + threads, don't mix well

A trash "bag". It's the nature of the beast, as you've seen in your 1st foray, you are likely to dig more trash than treasure. This is a great time to re-enforce good stewardship. Bring an onion bag or 2 to place all the junk finds in and dispose of them in a proper receptacle when you leave the beach. Small length of cord attached allows it to be slung over shoulder or slightly longer cord can be tied around waist and dragged behind.

Small goodie bag so treasure doesn't get "re-lost"

Have Fun!!!!