I made my first 3-day weekend trip to Texoma last Fall and stayed at Flowing Wells Resort. I absolutely loved it and I have already made a reservation to go back this April. The community is gated (they have to give you a gate code) and I felt very safe with my boat and personal belongings. I put my boat in the water and kept it in one of their empty slips at the marina at night. I rented one of their cabins which was 20 feet from the water. They have options from 1 bedroom up to 4 bedrooms. I recommend one of the "Sunset Village" cabins. They were very accommodating and gave personalized service like they knew me.
While most anglers talk about fishing the East side of the lake, this is on the Western side. But I found tons of fish and enjoyed the quietness. The only negative I can think of is the boat ramp is very flat (not steep) so I had to drive further out to get my boat in the water. But the tradeoff is that I kept my boat in a slip and didn't have to use the ramp every morning. I'll try to post some photos tomorrow.
http://www.dfwresort.com/lake-texoma-cabins/