The vacation vibe at Samui just got an interesting tweak. The promising newbie is the one to check off your list. When beach day equals party day, Seen is a no-brainer. You have got to give it to them: It does gracious, beachside luxe exceptionally well. Set in the vibrant beachfront mini resort of Avani Chaweng, dispensing cheerful Ibiza-inspired vibes, oodles of live entertainment and a swanky pool with a hopping bar, sumptuous day beds, snug cabanas and picturesque views of the beach, this is your personal sand haven. The star of this property is the mixology station that moonlights as a reception zone for guests who just want to get…