I just watched Santo vs. la hija de Frankestein last night and I gotta say I enjoyed it. Plenty of action and laughs (some intentional some not) and graveyards and underground crypts. I also liked getting to see the ape man from Night of the Bloody Apes turn up as a sparring partner for Santo.
This one was a little on the goofy side but I'd still recommend it. Santo kinda reminded me of a Star Trek era Shatner, needing just the flimsiest of excuses to do his scenes bare chested.