I am building a drive way for my boat and rv... 25x46.. what is the best way do I do cement or gravel.. and how much should it run$$$$$

Concrete would be superior to just gravel but its much more costly, concrete requires a gravel base. The total cost is dependent on where you live. You can calculated your yardage and call a conrete supplier to find a delivered price. Are you thinking of finishing it yourself or hiring a pro? If hiring a pro ask him to get prices too.