Welcome to the hobby, the game, and the forums!
Some good answers from Emmanovi, and I’d also reccomend the Spoonie Larpers FB group.
You can get cloaks and the like treated to be rain-proof (or sprayed with rainproofing after purchase). I’ve seen the occasional parasol, folk stomping along under shields, I’ve worn an anorak under a top layer so I look drenched but my core is fine, I’ve seen folk wearing enough layers that they don’t notice… but if it’s tipping it down, I’d duck into a tent if I were you Plenty of folk will happily allow you to step in for a chat and to get out of the rain…
There is a certain amount of seating, and carrying a chair can get a little wearing. However, one friend found an awesome mini-stool that is little more than a pad on one leg, but collapses into a beer can size black cylinder on her belt… I’ve looked but can’t find it online…
Interesting question… due to safety, there’s some things you can’t do even if you have the physical ability (pick up an opponent, climb up the giant monster). And due to physical constraints, there are a lot of things you can’t upgrade beyond YOUR ability.
Quick couple of terms here:
Soft Skills: stuff on your character sheet, which your character can do. Including casting spells, chopping someones leg off in a single blow, holy blessings, being thumped a lot without dying.
Hard Skills: Stuff that is determined by YOUR abilities, including public speaking, being able to walk around a field looking for someone for over an hour, ability to larp-sword-fight, falling over dramaticaly.
Obviously the magic stuff is soft skills only*, and the more physical stuff, such as fighting, is more hard skills. Your best bet for boosted apparent physical ability (in this system) is the Heroic Skills set.
Examples include Unstoppable (covered above), Cleave (cutting down opponents in one blow), Strikedown (knocking folk over with one blow) and Relentless (takes crippling injury and carries on). These will make your character harder-hitting and more resilient, but you need the hard skill to back them up…
…and unfortunately, for the high stamina scout, you’ll have to use hard skills. For over an hour of running around in the woods, I’d go for some cross-country running, plenty of hydration, and maybe a sugar rush on the day
*If you can cast magic in real life, I suspect that PD will happily employ you to do special effects