With the exception of a $15 taxi ride to the airport (not today - as a newbi you are going to pay more like $25, although you can negotiate it for $20) - really not a huge issue - if you were a little less green, I'd tell you to take the bus - all in w/ taxi to your hotel is like $3 - next trip maybe.
Oh - while on the subject of the airport - after you pass through customs, walk back across the street and go upstairs where the ticket/check in counters are - walk towards the Spirit counter and across the way from it is the Exit Visa place - now its $28 - was $26 - buy your exit visa - then its done and you will not have to worry about it. More important, right by the exit visa location is a BANK - change some dollars for colonies - do NOT go to either of the 2 "Cambios" located in the Airport - use the bank only - otherwise, its a rip off.
I can't in one sense "fault" you for wanting to know for sure, but CR is not like visiting Paris, London, or NYC - you really have to adopt much more of a "go with the flow" and less planning is better attitude, and not worry so much - trust me - if you walk into a MP and don't see what you like, they are not going to rase an eyebrow if you walk out - believe me, Ticos do it all the time.
If you are approached by someone not to your liking at the the DelRey for example, its fine to say you are not interested, and you don't - and really should not - buy them a drink - I've found the ugly ones to be pests and you don't need to worry what they might think.
While I could co on and on, you really need the services of an experienced guide - so let me recommend 2 members who do it "professionally" and you can contact them by their names and PM them:
Pops
Bilko
Know them both; great guys and will help you out a lot - frankly, for you, its a must
As to your comment re flame wars; you should have read the board a few years ago; today is nothing

(Hell, its a message board on the internet - you are not surprised, right

) There is a ton of great info; in fact this has been a very good thread as far as info being shared.
And finally, my nervous friend, if you listen to nothing else I have posted, take the tour, and go with the flow - you will have a great trip
