Dear aqtpie2,
I think we searched the prices on about all of the car rental places and found Trifty to be the cheapest. The car we had was nothing special but heck I'm not buying it I'm only renting. As for stopping at the Singing Sands before you get to Placencia, it's hardly worth it, you are only about 6 miles away at that point, and to tell you the truth we stayed there two days and had a most unpleasent expeience. Have fun ML