Races: The Tíraleth

The tíraleth claim descent from the ancient hero Talyll, who was said to be the champion of the war goddess and to have the blood of both fey and dragons. They are sleekly muscled and fairly tall, with skin that is marked with between three and five bright colors. Their ears are pointed, their eyes—which are usually primary-hued—have three to seven pupils, and their hair is dark at the roots, light at the tips, and usually red or red-tinged.

• +2 Dexterity, +2 Charisma. Tíraleth are agile, and tend to have forceful personalities and exotic good looks.
• Medium: Tíraleth are Medium creatures and have no bonuses or penalties due to their size.
• Normal Speed: Tíraleth have a base speed of 30 feet.
• Darkvision: Tíraleth can see in the dark up to 60 feet.
• Low-Light Vision: Tíraleth can see twice as far as a human in conditions of dim light.
• Observant: Tíraleth receive a +2 racial bonus to Perception skill checks.
• Weapon Proficiency: Tíraleth are proficient with falchions and scimitars.
• Sun’s Fury: As barbarian rage, with the following modifications: May be used for a number of rounds per day equal to 2 + the tíraleth’s Constitution modifier. The tíraleth’s increased body heat in Sun’s Fury adds +1 fire damage to unarmed attacks; opponents who make unarmed attacks against a tíraleth in Sun’s Fury take one point of fire damage per attack. The tíraleth receives a +2 circumstance bonus to Intimidate checks while Sun’s Fury is active. Sun’s Fury does not give a tíraleth without barbarian levels access to rage powers; however, a tíraleth barbarian may choose to add the effects of Sun’s Fury to his class-granted rages as a rage power.
• Fire resistance 5.
• Cold Vulnerability: Tíraleth suffer a -1 racial penalty to saving throws against cold effects and a -1 penalty to fortitude saves against damage from cold environments.

The tíraleth are my oldest race concept; as such, they've had the most work put into them.  As you might be able to tell, there's some Celtic mythological inspiration. 

Question for the readers:  What I really need here is Pathfinder-geek help:  How's the balance on Sun's Fury as a racial ability?  Any suggested tíraleth-specific feats (or even tíraleth-specific barbarian rage powers)?