My recommendations are:
- the dollar slots-A-fun craps table, pretty close to the Ho. 2x odds max, pretty difficult to lose a lot of money here. Put down a two-way pass line bet, the dealers don't see much tipping here.
- playing the ponies for an afternoon. Usually $2 minimum bets, races every half hour, if you get decent cocktail service it's a great afternoon. The 'Dust is legendary, but I prefer Caesars.
- quarter or nickel VP at the bar - the bartender is never far away. Take your time, it's not a race.
- there should be plenty of low limit BJ, between the Ho, slotsAfun, and the Sahara.
- anything downtown, but especially the Golden Gate and the El Cortez. The 301 or 302 will get you there (302=express) in decent time, most of the slow traffic on the strip is south of the Ho.
I like Jenaphirs idea of the 'casino run'. If you haven't already, you can sign up for slot club cards and ask about funbooks or other coupon books, which sometimes include matchplays and/or free drinks. Plus it's an amusing collection in itself.
However, quite possibly the best investment I've made in Vegas is a couple cocktails in a lounge with a view of the world going by. Good times.