I split the different lots/venues across the different neighborhoods of Newcrest and Magnolia Promenade. I like to keep the other worlds community lots as they are. I've always played like this and just really hate changing any of the Maxis made lots. I will do some changes like adding in a yoga room in a gym or redecorating the base game nightclub/bars etc. I've yet to find a good use for the lounge and museum in Oasis Springs so those lots I will change one day when we either get some more new useful community lots or maybe just make my own.
Newcrest neighborhoods looks like this: The one with the huge waterfront lot has restaurants, karaoke bar, and the large lot is a park with all the extra sporty stuff like water slide and basketball and one nightclub
Another neighborhood has a science themed library with rocketship etc, the spa day lots and a cafe
The other (the one with a fishing pond) has smaller lots I've made, a Gamers Den, a Garden Center, a pizza 'restaurant' and pool venue and the largest lot will have a bowling alley/venue.
Magnolia Promenade has one NPC run cafe/bakery that has baked goods to buy but also free samples and the GT coffee machine so my sims can eat and drink there too, an underwater restaurant that I downloaded (it is fab!), a vamp hang out/bar and an empty lot... just in case I want to dabble in retail again at some point.
It all seems a bit mixed up but the builds compliment each other so it doesn't look too bad. At one point I had all the nightclubs in one neighborhood and all the restaurants in another etc but it looks much better having a variety as in rl those kinds of places are found next to each other too.
I have this layout saved and called 'Generic World' and I have placed all my fav sims into houses, apartments etc and use this save when I want to start a new game (just place my new sim in it and save it under a new name) as this way I don't have to keep remaking the empty worlds and lots.
The residential lots I change a lot as I enjoy building my sims their personalized houses. The area where Johnny Zest lives always gets a make-over and becomes a bit more mid-century modern and less trashy. The one area I hardly ever change is where the Goths live. But I have some ideas for more vampy/grungy and run down gothic builds that might go there.