Hobby lot

In the Sims 2 FreeTime expansion there is a secret lot for each hobby. Increasing a Sim's enthusiasm in the hobby to level 5 will reward them with access to a special secret lot. Sims can take other Sims with them to the hobby secret lots even if the invited Sim doesn't have access to the secret lot. Some hobby lots also contain items only normally available as career rewards.

Science: Aspirational Laboratories
The Aspirational Laboratories lets scientific Sims interact with other scientific Sims and gives access to a telescope, TraumaTime "Incision Precision" Surgical Training Station, a SimSanto Inc. Biotech Station, and ant farms. Sims can gain skill points and talent badges when on secret lots.

Film and Literature: Desirable Discourse
The Desirable Discourse lets media minded Sims interact with other media minded Sims and gives access to a mini theatre for group movie viewing, computers for writing books, and bookcases for having book clubs.

Games: Games of Glory
Games of Glory lets gamer Sims interact with other gamers, and gives access to pinball, pool, computers, video games, and chess for their gaming pleasure.

Music and Dance: My Muse
My Muse lets musical Sims interact with other artistic Sims and access to a variety of instruments, and a DJ for dancing or mixing.

Arts and Crafts: My Muse II
My Muse II lets artistic Sims interact with other artistic Sims and gives access to pottery wheels, easels, SIM series Drafting Tables, and sewing machines.

Nature: Peerless Park
Peerless Park lets naturalistic Sims interact with other naturalistic Sims and gives access to a fishing pond, AquaGreen Hydroponic Gardens, a Carefree Koi Pond, and a beautiful park to catch bugs in.

Fitness: Platinum Gym
Platinum Gym lets health-minded Sims interact with other health-minded Sims and gives access to a pool, exercise machines, and a Exerto Selfflog Obstacle Course.

Cuisine: Sue's Secret Kitchen
Sue's (Secret) Kitchen lets cuisine loving Sims interact with other cusine loving Sims and gives access to a variety of kitchen utensils, a Schokolade 890 Chocolate Manufacturing Facility, and a cooking judge for cooking contests.

Tinkering: Will's Garage
Will's Garage lets mechanical Sim interact with other mechanical Sims and gives access to a variety of electronics to tinker with and a train set to play with.