What are the best Day Trips in Otopeni?

The best Day Trips in Otopeni according to Viator travelers are: <br/><ul><li class="my-2 my-lg-0"><a href="https://avionero.partner.viator.com/tours/Bucharest/Day-Trip-to-Draculas-Castle-Full-Day-Tour-from-Bucharest-Small-Shared-Group/d22134-16115P41" target="_blank" rel="noopener">Peles Castle, Dracula's Castle and Medieval Town of Brasov in one day</a></li><li class="my-2 my-lg-0"><a href="https://avionero.partner.viator.com/tours/Bucharest/Private-Day-Trip-to-Prahova-Valley-from-Bucharest-including-Sphinx-Babele-and-Caraiman-Cross/d22134-7793P12" target="_blank" rel="noopener">Prahova Valley Private Day Trip with Sphinx, Babele, and Ialomitei Cave</a></li><li class="my-2 my-lg-0"><a href="https://avionero.partner.viator.com/tours/Otopeni/4x4-Private-Tour-in-Transylvania-1-day/d50617-23862P3" target="_blank" rel="noopener">4x4 Nature Tour in Land of Dracula - 1 day</a></li></ul>