Hidden Valley is 5 km's from the nearest beach, I cant see how it could possibly be the "go to preference" for any surf craft.
You are just heading into the full blown surf season over there now so I wouldn't recommend any SUP spots quite frankly, I prefer the off season on the Nusa Dua to Sanur side, there are several spots certainly more suitable for SUP over there as opposed to the Kuta area full season, also many of the breaks south of Hidden Valley cop plenty of large swell and again I would be very wary of SUP ing there from here on in until around November.
Others will disagree with me I'm sure, I have a low crowd tolerance level and my recommendation reflects that.
When are you planning to go and what is your ability level?