You should post this on the Holiday forum/ Very creative gals over there who may be able to help.
Would you want to go with a Flamenco theme?

why not set up a tapas bar, and keep the "theme" more as good food? (ast 80, you've seen and done most of it...)instead, why not go thru family photos and do a memory page?

i found this site...

http://www.ericweisstein.com/fun/wine/tapas.html

You could use the Mexican flag colors to decorate in. Use a Mexican serape (blanket) as a tablecloth. For fun-create a pinata for your birthday guy to hit but because of his age-cover the pinata in several layers of tissue paper-easier for him to break. Inside could be gift items for him! Denture cleansers, chap stick, life savers, crossword puzzle book, etc-stuff he'd enjoy.
Serve a pot of Mexican chili with a salad & pita bread halves...and a Mexican cake of some sort. Get a big sombrero & use as a centerpiece-lining it with plastic wrap & placing tortilla chips in it with salsa bowl to the side.
It would be cool if you could locate a supplier who carries Mexican jumping beans and use them as favors for the guests-maybe wrapped in bright tissue paper along with some candies of some sort.

By spanish do you mean Spain or Mexico? That could make a big difference.

Spanish theme, My dad will be turning 80 yrs old and he is from Puerto Rico, any ideas for decorations and entertainments. Thank you for your ideas.