Haha, I won't try to answer what I'm not sure about, but...
I thought renting a car in Mexico was pretty expensive, due to the insurance and so forth?
Yes, you want full & total insurance, but it's pretty cheap with some providers. I got hot over the delivery service in PDC but I'm a hothead anyway. Try
Cancun Car Rental, Rent a car in Cancun, Playa del Carmen Easy Way Car Rental Be very careful about booking one with automatic if you don't like shifting gears; I don't mind shifting gears, but that little underpowered put-put we booked had to be shifted a few times for each speed bumped and always made a loud noise about the last gear - never did figure that out? Also note that they are not all air conditioned. Then I saw a last minute special on our chosen car close to trip time and tried to get the rate lowered. Nope. Should have booked it in my bud's name and canceled mine, but on well. Our biggest challenge was finding the Cancun station for car return. I finally gave up, phoned them, told them they had to come to the airport to get it. Glad I got away with that. Get the Cancun airport map.
Be careful again about gas. Being American, I presumed all the stations were open Sunday mornings. Ha! Top it off the night before you need it -
but watch out for the helpful locals who want to do it for you - be sure the meter is zeroed out. Most locals are pretty nice folks, but one crook can spoil your day.
I really don't know what a reasonable price is. I have it in my head that, "it's Mexico - it should be cheap
Sure, if you wanted to stay in a hotel that a working class local would stay in. You don't, and your wife would divorce you.
We just need a place to sleep really.
May I suggest a safe place would be a good choice. The peninsula is not like Cozumel, and you want to be prudent about some choices at either.
It would be nice if it had a pool.
You plan to spend a lot of time at the pool?
It would be nice if it were closer to the center of things than far away. It would be really nice if it makes it easy to catch a ride of some sort to the airport in Cancun. It does need to be secure though.
We'll only be there two nights - and one of those days we'll be gone all ay to the ruins. So, we don't need much. I just dunno what's a reasonable rate.
You should be able to find a nice, safe place in PDC for less than $100US I think. I don't know about the other areas. Once you decide where you want to stay, get the maps. This page
Hotel locator shows the toll road from Cancun airport to close the the ruins. Very nice road; loved it - until we couldn't get off to go to Holbox, big mistake! For you, great.
This page
Yucatan Peninsula Map : TravelYucatan.com shows the main roads of the peninsula - the ones you want to try to stick to. If you search the net, you can find reports of cutting thru the country and Mayan villages from PDC to there, but don't try it. If you stay in PDC, go to Cancun and veer left to the toll road.