Congratulations on the trailer and welcome to the JOF.
This is probably not much help, but.....
IMO, if you want to stay near a 'tourist destination' like Legoland, generally you'll have to plan to stay in an RV park. Except for truck stops, most free places have gotten overloaded and RVers are no longer allowed to spend the night.
In most cases, too, you would not be allowed to drop your trailer there. Even truck stops where you can spend the night, you wouldn't be able to leave your trailer there while you went into a park etc.
There are discount groups you can join (Passport America is one) and you can buy a membership (Thousand Trails is one) to find lower rates in RV parks.
Sherm & Terry w/rescues Steve (std Poodle) & Eydie (min Schnauzer)
2015 Jay Flight 27RLS (Camped: 102 nights 2015, 90 nights 2016)
2006 Ford F350 6.0 PSD, Lariat, 4WD, CC, LB, SRW, auto., Camper pkg.