Welcome to central Texas, the windflowers are still at their peak. Georgetown would be your best bet, it's about 15 miles east of Leander.
The city has transient tie downs and there is a large FBO, GTU Jet, on the East side of the airport, each can arrange a rental car if you need one or you can be picked up by your relatives.
There are a number of good BBQ joints in the area, I'm sure your brother-in-law will have his favorite. And the TexMex is also very good in this area.
Hopefully, you can set up a meeting with Mark Goldberg to talk about the Bearhawk...
N299AD RV8 QB, IO-390X, BA prop...SOLD
N199AD One Design...SOLD
N99AD BD4, flew for 22 years...SOLD
EAA Tech Counselor/Flight Advisor
CFII, MEI, CFIG