the pwps you use really depend on your town theme! if you have a more foresty, nature-y town, projects like the log bench, hammock, zen bell, picnic blanket, bus stop, park clock, zen clock, instrument shelter, streetlight, zen streetlight, water well, fire pit, and hot spring are really nice. for modern towns, the video screen, parabolic antennae, solar panels, traffic signal, tower, wind turbine, bell, tire toy, pile of pipes, chair sculpture, modern clock, fire hydrant, fountain, modern streetlight, and cube sculpture are great to put in town!
here is a list of all the pwps in acnl! hope i helped!