Just don't stay in the sun for lengthy periods. I had a very bad experience a few months ago.
I stayed on my back in the sun (it was about 30 degrees celcius with a VERY intense UV) and i had no sunscreen. Anyway, not long when i got home from the beach i was as red as you can - practically that dark red that looks like a sorta purple. Anyway, i was in alot of pain and had heat stroke as result which is also bad. I started peeling about a week later and it took about a full month for my skin to be back to normal again and even for weeks after that i had lines where all the skin had peeled off. Now i have a whole load of moles on my chest from the burn. Luckily they are only small and only noticeable close up anyway my point is - don't overdo it.