Hi! Will be in Serbia for a wedding, and thought I'd make the best of it by touring around a bit. We would be there for 2 weeks. Just wanted to run this by some of you for advice, to know if it's doable, or if I missed some "must-see" things, or if I'm seriously underestimating the driving distance, etc.. We would rent a car for everything outside of Belgrade. Suggestions are welcome!
Days 1-5 : travel from Canada, arrive belgrade next day. Belgrade fortress, Knez Mihailova, Saint Sava temple, Skadarlija street, national museum, tesla museum, botancial gardens. Includes time for the wedding and visiting family. (sleep in belgrade)
Day 6: novi sad: petrovaradin fortress, sremski karlovci, drive to fruska gora (sleep fruska gora)
day 7: visit monastaries, wineries, drive to subotica (sleep subotica)
day 8: visit subotica, visit lake palic, drive to mokra gora (sleep mokra gora)
day 9-10 : drvengrad village, sargan eight train, tara national park, maybe stopic cave, maybe bear watching in tara national park (sleep mokra gora)
day 11: drive to nis , stopping by studenica, visit nis (tower of skulls, fortress) (sleep nis)
day 12: visit pirot (family) and see fortress, sukovo and poganovo monastaries (sleep nis)
day 13: back to belgrade, see a show! (philharmonic) (sleep belgrade)
day 14: travel home

It's feasible. There are some more monasteries and other sites close to your itinerary and above all in neighbour countries, just a fes miles out of Serbia.
May be you should need 1 day more in the Tara National Park.
But in 2 weeks, you cannot visit everything.
IMO the plane of Baska and the mountain areas of Tara and Pirot are a good mix.