OK, I'm gonna skip 4 pages (for now) and just lay out how I tip for a party of two.
No tips at motels, as they're rarely ever more than a night, same goes for a 1 or 2 night stay, as we are well kept, and actually prefer that no housekeeping is done. We reuse towels, make our own beds, and i'm the guy who uses the McDonalds bag we grabbed a snack in to keep extra trash in, and we barely have any to begin with. There are a few exceptions I'll get to in a few...
Whenever we stay longer, we'll leave $5 for each day we receive housekeeping. By the time we'd need it, they just might deserve it. On our trip to WDW in a few months, I plan to use housekeeping daily, because we'll be in vacation mode for 7 days, and wouldn't mind the daily quick freshen up to the rooms. I liken this type of stay to a cruise, although you may not have the same keeper on land. Said exception is for places like The Inn at Christmas Place (Google it, you'll love it!) [My GF is the "Christmas Queen" and absolutely loves all things Christmas], as they always have special touches and they genuinely care about their guests. I mentioned in a casual conversation at the desk one time that she loves the smell of a fresh cut Christmas tree, so they went and got air freshener JUST FOR US for our room, and they've done it for us ever since.
As far as restaurants go, I never, Never, NEVER tip based on the check. I tip on service, and the usual for me is $2-3 per person. One time, at a rather nicer restaurant, we saw our server three times: Menus and drinks, meal order, and the check. We got waters and a cocktail each, and not one offer of a refill or 2nd drink, and a sour attitude to boot. I left nothing. I would have left a buck if I had seen a smile. On the other hand, there was a time when our glasses never hit half empty, the server greeted us and was super polite, and checked back with us continually. I left him $20 on a $30 dinner for two.