Hey Boulder, El Ceibo is DEFINITELY the easiest border crossing. The Immigration guy is actually pretty cool, won't gouge you, and was totally easy going about entering ... (I actually entered Guatemala BEFORE I checked out of Mexico because the Mex Aduanas office was closed ... he didn't even check my passport the next day when I came through a second time.) The only worry about exiting there is the lack of an SAT office. You could try the office in Flores, but they didn't know anything at all about vehicle permits when I stopped by there, so it's probably not helpful. (But if you need to know where it is, it's up on the hill by the cathedral. Walk up the steps, then turn to your right on the next street. It's a long low building with dark glass windows and a blue sign over top.) I have to agree with everyone on the Tikal thing ... It's seriously a must. I don't get too bugged about the OFFICIAL price differences ... for the reasons other people have stated. The government needs money to maintain the sights, and if they charged the amount they needed then they'd totally exclude their own citizens from their own heritage. It's not ideal. We have our own versions of two-tiered pricing going on. It's what's involved in getting travel permission to ENTER the USA. We have it good when it comes to travel.