To start with, Ongole is the largest city in Prakasam District and therefore will onto the path of urbanization. You can find very good 20+ hotels to choose from online. I preferred Sreekanya hotel near Nellore bus stand. Hotel was decent but I guess the choice of place for a non-vegetarian is sad part. Very difficult to get that easy Non veg Thali or bunch of non veg restaurant on this stretch. Since ongole isn't that far from Hyderabad, you would be dropped before it's 6am irrespective of how late you board bus. The restaurant just in front of Ongole bus stop is a good one to start your day with authentic South Indian breakfast. We checked into hotel and freshen up. To be honest, you have interest in Holy sites, then you get quite a few options to explore else Beach should be on your card first. Roamed the city for while on Trunk road etc. Noticed Alluriah sweet shop and Murty sweet shop. For Ongole famous 'Mysore paak', you got to visit it once. Be quick, their stock last for very less time and soon you would see 'Sold out' sign.
Found it really difficult to lunch with not much of an option than little Chinese fries and Veg Meals. To avoid any unforeseen stomach upsets, prefer Veg Meals.
Ongole has a stunning and peaceful beach in the Kothapatnam village about 15km away. You got to carry all your needs as this isn't the routine Tourist attractions. Apart from boats venturing into sea and people ripping their yield, you do not get to see much. One more thing I noticed that I didn't get to read anywhere online, a Sea facing resort has come up here. Didn't get much of time to enquire about it. If you do not have a pre-booked hotel, go to Kothapatnam and try your luck.