Well, its hard to say. By predator I assume you mean the race in general and not a specific one from the movies or books etc. If I were to make them a race it would be pretty powerful. And you would still have to design all their equipment (which you probly dont want you characters to get their hands on)
Here is a quick little predator. They gain class levels as normal.
Predator: CR 1; Medium-sized Outsider/Alien; HD 1d8+4; hp 9; Mas 20; Init +4; Spd 50 ft.; Defense 17, touch 14, flat-footed 13 (+4 Dex, +3 natural); BAB +1; Grap +6, Atk +6 melee (1d2+5, punch); Full Atk +6 melee (1d2+5, punch), or +5 ranged; FS 5 ft. by 5 ft.; Reach 5 ft.; SQ low-light vision; AL none; SV Fort +4, Ref +6, Will +0; AP 0; Rep +0; Str 21, Dex 18, Con 20, Int 15, Wis 10, Cha 8.
Skills: Climb +16, Jump +16, Listen +3, Spot +3, Survial +4.
Feats: Track
Predators have a +8 racial bonus to Climb and Jump checks, and are not limited by their height when jumping. They also gain Track as a bonus feat. Since Predators are not from earth, they gain Predator weapon proficiencies, and treat earth made weapons as exotic. Some especially powerful weapon such as the disc, are still exotic to a predator.
Predator: CR 12; Medium-sized Outsider/Alien; HD 3d8+8d10+66; hp 129; Mas 23; Init +7 Spd 50 ft.; Defense 29, touch 26, flat-footed 13 (+9 Class, +7 Dex, +3 natural); BAB +7/+2; Grap +13; Atk +13 melee (); Full Atk +13/+8 melee (), or +14/+9 ranged; FS 5 ft. by 5 ft.; Reach 5 ft.; SQ low-light vision; AL none; SV Fort +12, Ref +13, Will +4; AP 6; Rep +3; Str 23, Dex 24, Con 23, Int 16, Wis 13, Cha 8.
Skills:
Feats: Advanced Firearms Proficiency, Alertness, Combat Martial Arts, Dead Aim, Far Shot, Light Armor Proficiency, Personal Firearms Proficiency, Simple Weapons Proficiency, Track
Talents (Fast): Evasion, Uncanny Dodge I
Talents (Tough): DR 1/-, Remain Concious
Talents (Solider): Weapon Focus: Predator Spear, Weapon Specialization: Predator Spear, Tactial Aid, Improved Critical: Predator Spear
Yea, I'm really bored at work. I didnt feel like doing the skill points though, alwasy takes so long. Still working on finishing this out.