From street level "The Blue City" may seem like a misnomer, but once you get up to the hill where Mehrangarh Fort is, suddenly it all makes sense. There isn't a whole lot to do in Jodhpur, but I think you'd agree from below that there are at least a few things worth seeing.
1. Clock Tower/Sardar Market. There's a place called Mishrilal Hotel that serves THE BEST lassis.
2. Mehrangarh Fort.
3. The Blue City from above.
4. Jaswant Thada, a mausoleum not far from the fort.
5. Autorickshaws. A stand near the guest house.
More of Jodhpur here.