Accoding to "let's go to the wiki" you stay outside in full sun and the next day you are tan. It's July 17, I spent five hours onthe 16 ( I tt because of vacation) and today impale as a ghost! What happened?
One kitten a day equals 46% of your daily protein allowance. ACCF: 3094 0639 0701 Miki in Koi Town
Just normal play seems to get me a tan, : ie walking around town, partly on the beach, but not that much on the beach (Liquefy says at least 15 mins of play - so very little play will get you a tan). I don't think it necessarily has to be the beach, just the town in general.
No umbrella, that will prevent tanning.
You can only go one color stage per day (probably ?) - and the first one or two stages are hardly noticable.
I thought I wouldn't tan as I play all 4 characters equally, so any one character may not play every day, or not play within the tanning period (10am to 5pm) but up to now I'm slowly getting browner on all characters, albeit more with some than others.
From Liquefy's faq: tanning season July 16 to September 15 , 10 am to 5pm. And 15 mins plus of playing time outside - just says in town, not specifically the beach.
I read somewhere, sorry can't remember the poster, but a way of telling whether you are tanning or not is to make a plain pattern made from the flesh color (can't remember the pallette either) & wear as clothes - and your face (& arms?) will start to show up against it. The first stage or two I wasn't sure I was tanning, but I'm defintely brown now.