Center Console Boats And More

Should I buy a boat in Thailand/Malaysia/Singapore? Budget is $20k?

Ok, I've never even been on a boat in my entire life. But I'm fascinated by boats, yachts, etc.

My budget is around $20,000 ... and for this price, I've only seen very simple pontoon boats.

I'm going to Thailand this year - and I wanna go along the coast to Malaysia, and Singapore.

What sort of boat will be suitable for me? (It's just me and my girlfriend).

Should I buy 2nd-hand or new? What will fit in my budget of $20,000 ?