Well there is already a fire pit jeana, its in the outdoor activities section. But it would be cool to have a poker table, or other card tables. It would be cool if there was an expansion pack that actually had an arcade as a new community lot, and perhaps in playing enough games, you can accumulate tickets you can spend on different prizes for your Sims. Toys, books, electronics. The kinds of prizes you used to find in arcades all over the place, but for the most part seem to be a lost industry.
Would also lover to have my Sims able to surf and do other various water activities. I think it wold be cool if you could teach your child Sims to swim just like your teen Sims learn to drive, or toddlers learn to walk, talk, and use the potty. Perhaps it could be at the toddler stage that you teach them to swim, though that would be piling on a lot of things to teach your toddler before they age up.