I'm a firm believer that climbing trees should be left to critter's. coons, possums and monkeys.
I like using ground blinds and a lawn chair. The blinds contain your scent, conceal your motion and keep you out of the rain or snow. The lawn chair makes sitting for long periods comfortable and if you get one with a high back, you won't get a sore neckwhen you nod off for a nap.
Most of the blinds are light and can be set up in just a few minutes. They're packable so if you have to relocate it can be done in a few minutes as well.