As long as you have Park tickets, you can ride the Monorail. However, if you are staying offsite, you will find the Monorail inconvienent. It stops in DTD which is easy if you are at any of the Disney Hotels, but if you are offsite there is no theme-park parking that will take you easily to the Monorail. Most of the non-private vehicle access (busses, cabs, or walking) is located on the opposite side of the park from the Monorail terminal. So, it is quicker to get into the park from the maingates than the monorail if you are walking or using public transportation.