U Male Massage and Spa
(can't find it any more on the internet, anyway there was no address)
(some km northeast of town center)
Little activity, you can see users as far away as Lao or Cambodia.
Tung Sri Muang
Park in central location, many people in the evening and at night, but I didn't witness any cruising. Outdoor gym with many shirtless hunks. Nearby night market many people. Actually, I didn't see any signs of cruising or prostitution throughout my stay in Ubon. But I met a group of obviously gay students at the river at a restaurant.
Websites I used to prepare the trip
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