I did the Altun Ha, river combo. Ruins were okay. Since it is an active archeological site, I was hoping to learn a bit about the process....no go.
Saw critters on the river, though. I got teased because even with tour guide, boat driver and a local wildlife lookout, I was the one who spotted the croc's. I explained that since I live in Florida, 1/2 block from a wetlands preserve, I have learned how to look for gators! Anyway, it was fun, but not one I would do again.
I visited Xunantunich in 2006. I haven't been to Altun Ha.
The whole trip was quit a bit of fun. Unlike some places we could climb the temples, including the BIG one El Castillo. We were one of the first tenders out and perhaps the last back, so this obvoiusly is an all day affair. It does include lunch in thatch hut near San Ignacio. As for wildlife I did see some leaf cutting ants. The Mopan river crossing was cool on a hand cranked ferry.
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The best way to spot gators or crocs is to look along the edge of the water. They are almost impossible to see in the water, but they like to relax during the day on the banks of rivers/streams.
Here, where we live, any fresh or even brackish water is likely to have a gator. Signs everywhere saying do not feed the alligators! I wish that wasn't needed...I mean, duh!....but people do. Then the gators associate people with food and they aren't very bright, so don't get the difference between a hand out and a hand. Actually, American gators are the most mellow of the croc family, but they will wander up and snatch an occasional dog or cat. Once in a great while, they wander into homes when people leave doors wide open. On the plus side, we also get almost every type of bird and misc critters in the neighborhood. Otters to bald eagles.
Easier, and safest way, to spot gators and crocs is a football game for one and the mall for the other.
But you won't be there at night! And unless you are really into wildlife, I would not try to go looking for them at night anyway....too many other critters that have same habitat and are nocturnal.
Glad someone got my joke!