Fiesta Grande RV Resort - Your FUN and FRIENDLY Destination for Active Seniors. Fiesta Grande RV Resort is located in Casa Grande, Arizona - situated centrally between Phoenix and Tucson and about one and a quarter hour north of Mexico and 10 minutes from the intersection of I-10 and I-8. This is a park with a really full activity calendar - including planned "field trips" to concerts, museums, and "you name it!" Clubs, teams, groups activities; it's all here.