Mobile Ad-hoc Networks (MANETs) are generally created for temporary scenarios. MANET nodes are mostly in mobility, where efficient routing is a challenging task. There are many applications of MANETs such as gaming, battle fields, habitat monitoring, file sharing etc. These applications have different requirement for example, gaming applications require higher bandwidth, security must be considered in battle field applications, informal outdoor meeting generally has no requirement except data transmission. These kinds of diverse applications emphasis research community to design adaptive and intelligent solutions for MANETs. In this thesis, we propose an Adaptive and Cross Layer Multi-Path Routing Protocol (AClMRP) for many challenging scenarios of MANET. Our routing mechanism operates keeping the type of application in view. For simple applications, it is inspired from traditional on-demand routing protocols by searching shortest routes from source to destination using default parameters. In case of multimedia applications, the AClMRP mechanism considers such routes which are capable to provide more data rates having less packet loss ratio. Those applications which need security, the AClMRP mechanism searches such routes which are more secure in nature as compared to others. Cross layer methodology is used in AClMRP routing scheme so that to exchange different parameters across the protocol stack for better decision making. Our approach is efficient and fault tolerant in a variety of scenarios we simulated and tested.