1500usd a month is about my budget. A few pointers:
I'd like to possibly rent a small house if possible
In the suburbs no problem, in bkk downtown or any touristy place no way. I mean you could but it would be more than half your budget.
I could stand a small apartment
Food. I'd like to be able to cook on my own
It's going to be very difficult to find a kitchen in a small
apartment in thailand. Most people just eat outside/go to the market.
I'd want some place with impressive scenery
Aim for the south then, you might be able to find something decent for cheap if you don't mind living away from town centers.
maybe get some golfing in
While cheap compared to western countries playing golf often on 1500 bucks is going to be frustrating. The good courses are around 100usd for a round.
is it impossible to own a motorcycle/scooter or anything there? I'd prefer to be dependent on myself for transportation.
It's easy if you can pay it cash, renting can be a pain in the neck.
The big question is : what about your party habits? can you handle thai food or do you need western food often? if you do not go out that often to party / not into the nightlife scene it's going to be ok. Otherwise i suggest going for a cheap apartment, you won't spend much time inside anyway.
Western food can be costly too.
I'm cheating because i pay 3000bahts a month for accommodation and i have free food everyday. But if you cut the apartment budget to the max you can have a ton of fun and save money at the same time in thailand.
With your 50k let's say you go : 10k apartment with electricity/water.
40k for food, golf,party and gas : enough for hours of fun imo.