After doing reaserch, I've found out that disney isn't the only person with rights to the name "Adventureland". Adventureland is an entertainment complex in -location not entered-. It is a carnival-style theme parkcomplete with log flume, ferris wheel, wave swinger, etc.
http://static.***********/77/214577553_2bef9ac666.jpg
A view of the wave swinger from outside the park gates.
http://www.esatclear.ie/~bannister/autoimgs/advld_hur.jpg
The Hurricane, adventureland's rollercoaster.

Cool, huh?

Very interesting but if you look in VMK on the adventureland signs it specificly has this next to it: ©

Just researched this. Apparently America holds claim to 2 ADVENTURELAND theme parks. Both Long Island, NY and Altoona, IA have versions of these parks. Considering these parks are not on a grand scale and they are classified as MINOR/SMALLER PARKS, almost in the category as amusement parks or carnival parks, I would believe Disney would not want to sue over the name.