Your doubts about this example statement are well-placed, because there are several issues more complex than one hopes to address in a critical thinking class about how opinions and statements relate.
I think the argument for it being a statement it this:
it is either true or false that the person who said it wants to meet a grizzly bear in the wild.
Thus we have something that looks like A or not A.
But there's several inter-locking problems with this in terms of example quality.
First, the use of "I" ties it into a thorny issue about how to treat demonstratives like "now" , "here", and "I". If we resolve it as I suggest above, we assume that we are looking at the statement as uttered when someone uttered it. If we leave in the demonstrative as a variable (when I (virmaior) says it, it means something different than when I (Susanne) says it). Let's assume that a good faith reading of the sentence will resolve this. (See here, here).
Second, "want" raises an issue that invokes questions in philosophy of mind. Specifically, are desires,etc. and things we normally attribute to minds, objective facts or are they outside of our scrutiny. For determinists and most species of materialists, this poses no problem since "wanting" is then an objective state that we could evaluate say using an MRI or some technology we don't yet have. Of course, for Kantians or Descartes, this is not the case, and desires and wants can be opaque to this sort of analysis. (See for instance here).
This second feature is impossible to resolve merely within the realm of basic logic.
It might be clearer with a separate example:
Jane likes Bobby.
This is actually a hard thing to say true or false about, because what we encounter are Jane's behaviors towards Bobby rather than Jane's feelings directly. If we think we can tell someone's feelings from their behaviors, then we will think this is a statement. If we don't, then we would not want to call this a statement. (For the sake of argument, perhaps Jane is a Russian spy trying to gain control over Bobby and get access to information, but for this purpose acts like she likes Bobby).
For this reason, I avoid these sorts of examples when I teach critical thinking, because it's best to pick examples that focus only on the feature in question, and this one raises two issues (demonstratives and internal opinions).
Just to qualify this again, I'm not here registering an opinion on whether
I do not want to meet a grizzly bear in the wild is in fact a statement or not, I'm just explaining two of the reasons why it's not great as an example statements insofar as it raises at least two questions we don't need to raise to look at statements more generally.