Mount Abu is good place to visit and having fun as it has very good environment and very beautiful scenery. There is many things that you can do but you must have good amount of money because they are looting very good amount of money from travellers as I visted in food store quality is worst and in many hotels price is like all price hike is only there.
Price of one bottle of water increase around 50% to 70% in other products too. In other things there is many thing that is enjoyable as guru shikhar which is at highest peak. There is also famous delvada's dera, naki lake, and sunset point and many more things.
Enjoy with family just don't forget take some photos in marvadi dresses they are also awesome and also don't forget rabdi.