There are three CFS2 addons that in my opinion are a must.
The first two are already mentioned by Stratobat and Brandon.
The Pac Tex textures make the South Pacific look sooooooo much better than the stock CFS2 textures. Land and water are visually enhanced 100 fold.
Get all the Mask Rider scenery. These are the best airfield scenery out there, believe me, I have installed tons of scenery and by far, Mask Rider is the best.
If you are confused on how to install the Mask Rider scenery, many are, I have a scenery installation tutorial on my site using the Mask Rider scenery as an example. Pictures and text to for easy follow along instructions for the "newbie" to CFS2 and scenery installation. Not that you are one. ;) Here is the link, get Fireman's tute.
http://www.brennt.com/hoppers/scenery.htmlThe third I recommend is going to FSW Active Sky
http://fsw.simflight.com/FSWMenuFsSim.html . Go into the FS2000 section and especially get all the cloud textures. Also get the FS Sky World Utility in the Utility section. Don't worry about "Hits" on frame rates. These cloud textures are smaller than the stock CFS2 cloud textures. Added bonus.
With these three enhancements just fire CFS2 up, load up a little weather or clouds and you will be amazed at the difference between the stock CFS2 you had and your "Enhanced" CFS2.
Good luck, have fun.
Systemax Sabre Ultimate gaming rig.
I got all the goodies and all the power I need to run anything thrown at me for the next two months!