^^^
First off, please get EVSEs vs. "chargers" straight. See http://www.mynissanleaf.com/viewtopic.php?f=6&t=14728&p=332668#p332668" onclick="window.open(this.href);return false;.
Generally, intended for public use L2 EVSEs (charging stations) are J1772 and thus you just plug that connector straight into your car. If you see only NEMA 5-15 or 5-20 outlets (http://evseupgrade.com/images/categories/outlet-types.png" onclick="window.open(this.href);return false
then you need to plug in your own 120 volt L1 EVSE. That's what comes w/the car. It looks like http://www.pluginamerica.org/accessories/nissan-level-1-cordset" onclick="window.open(this.href);return false;. The '13+ Leaf L1 EVSE is smaller and has a different handle design but the basic premise is the same.
Can you give some example locations on http://www.plugshare.com" onclick="window.open(this.href);return false; of charging for free at casinos?
If you leave your L1 EVSE outside and it get stolen, it's usually ~$600 to $1000 to replace. The PCS-15 at http://www.clippercreek.com/store/product-category/all-products/on-the-road/page/2/" onclick="window.open(this.href);return false; would be a suitable replacement at $500. You could take measures to somewhat secure EVSEs (e.g. padlock thru the trigger hole, if it has one and charging lock on '13+ Leafs). But, the charging lock latch on '13+ Leafs looks like it's nylon or plastic, so it can be broken w/enough force. Or, the wires could simply be cut.
If casinos provide 208/240 volt outlets like that of dryers or RV parks and NOT an L2 EVSE w/J1772 handle, then yes, you'd need to bring a proper portable 208/240 volt capable EVSE. Again, best to provide Plugshare links.
Examples of L2 EVSEs at https://www.chargepoint.com/guides" onclick="window.open(this.href);return false;. The CT2100 family has a single J1772 handle + a 120 volt (NEMA 5-20) outlet under its metal door.
Again, as we pointed out to you before, you will have horrible battery degradation in Vegas due to the crazy high temps in summer. Hope your driving needs on a charge are modest.