By now, everyone realizes that Houston's Museum District houses some of the most unheralded offerings in the nation. The Museum of Fine Arts, Houston's Cullen Sculpture Garden plays no small role in that reality. Forgoing sprawl for the placid intimacy of an actual exhibit, the garden spins themes as mixed as some of the pieces themselves, all paced alongside enough grassy areas that you can stretch out on a soft fall afternoon. Highlights include Joan Miró's prickly Ouisea and Dan Graham's mesmerizing Triangular Solid with Circular Inserts, Variation F, as well as the lascivious security guard who chuckles whenever you ask him about Aristide Maillol's Flora, Nude.