Board games are a good idea. Or maybe a family crafting project? You could gather the supplies and print out the directions with a holiday border around it. Miniature sand sculpture ornament or stocking holder to resemble one of your sand creations? You could use your sculpting talent to mold modeling clay or even salt dough (look for recipes online and directions for baking/hardening the dough), poke a hole for a ribbon if it's to be an ornament while still pliable, cure it, spread Mod Podge or plain white glue over the entire ornament, and dip it in sand. Heck if you do that, then you could enclose the leftover supplies for the kids.
Everything in moderation, including moderation.
2007 Rodriguez Adventure/B72
2009 Masi Soulville Mixte/B18
1997 Trek 820 Step-thru Xtracycle/B17