We did a day trip from Dubrovnik to visit Mostar (with Elite booked via Viator) and thought this trip was well worth it. The reconstructed bridge is astonishing. A walk across is quite steep and can be slippery as well, but a must do. Some of the best views of the bridge are from the mosque (also worth a visit) and from the restaurants upstream of the bridge. Do not attempt to jump from the bridge yourself, but you can watch locals do it (after they collect 25 euros from visitors).