Here's a few suggestions:
1. Healthcare -
- Get whatever benefits you can from your current (for two more months) plan. Get a full exam, bloodwork, tests, whatever the rules allow.
- Check into body & fender work. If you have a chronically sore limb, see if you can get a consult for physical therapy. If you have allergies, see if you can get a consult for an allergy-response or immunology evaluation. If you're prone to fits of workplace giggling, see if you can get a psych referral. (Oh, wait, nevermind, that's a normal symptom of FIRE-soon syndrome.)
- Refill maintenance prescriptions (especially if they're cheaper) in case there's a fumble of the healthcare handoff.
- Get a full dental exam, x-rays, cleaning, filling overhauls, bridges, crowns, root canals, whatever. I worked with a senior Navy guy whose retirement was almost held up while dental did a half-dozen essential root canals-- one per week. It was not a good way to enjoy terminal leave.
2. If you're entitled to any legal-advice or other services as part of your employment, use them. This includes pre-retirement counseling, portfolio reviews, outplacement services (especially recommendation letters?), office coupon booklets, stress-relief massages, filching the key to the executive washroom, whatever. You're not planning to go to work ever again but if someone will give you a free letter of recommendation (a good one!) it might come in handy.
3. Check your retirement benefits with an accountant or some other outside source. For example, my FIL gave his retirement lump-sum payment info to a group called "Pensionbusters" and they worked through a forensic-accounting evaluation of his company's pension calcs to see if there were any suspicious assumptions. As the union's shop steward he was ready to discuss any surprises with senior management... And make sure you know how much you're receiving for vacation time or other benefits that can be converted into cash.
4. Clean up any options, discounted ESOPs, 401(k) matches, or other last-minute donations to compensation plans. Pay back any 401(k) loans before you leave. Don't leave anything on the table before you roll all that stuff over to a new IRA. Consider the tax aspects of making the moves now or next year. If your company provides any free evaluation tools (for example, many 401(k) plans include a free subscription to Financial Engines) then use 'em before you lose 'em.
5. Think about an IRA conversion to a Roth. You might not want any more income this year but early next year might be a good time.
6. Check your income-tax witholding (fed, state, & locality) and make sure that you're not underwitheld for any final lump-sum payments or other last-minute checks. The next estimated-tax payment is due 15 Sep. Make sure your employers know where to send the W-2s & 1099-Rs. Seems pretty straightforward but I've seen it screwed up many times.
7. Call your insurance companies and let them know you're about to be a retiree who'll vigilantly stay at home all day protecting your insured assets. They might give you a price break.
8. Make sure there's absolutely no workplace confusion about your desires for a retirement ceremony, party, dinner, going-away present, whatever. Some will think you're reluctant to tell management what you really want, others will think they know better than you during your temporary period of self-delusion, others just enjoy arranging sadistic ambushes surprise parties. Tell 'em what you want and keep telling the same story to your co-workers & friends.
9. Did the company provide anything at home that you'll need to replace? Free virus-scanning software, unused frequent-flyer miles, company car, workplace VPN computer access, a Blackberry, subsidized childcare, housecleaner, yard service, mints on your pillow? Now's the time to deal with the changes before the service stops happening.
10. You sound like you're all over the HELOCs, and this is also a good time to apply for additional credit cards. After you retire you may not care about the impact on your credit rating but you'll do better applying now (while you have employment income). Are you planning to make any other large credit purchases like a new car, new appliances, or a new roof?
11. Does anyone in your workplace need anything from you now? Promotion recommendations, bonus requests, resume' letters, or any other largesse that you can bestow while you're still employed?
12. Are you leaving any nasty unfinished business? Do any of your subordinates have any lingering problems that you should take care of before the new guy has to start all over again? Any pending (or unresolved) deadlines, disciplinary actions, or felony indictments? This is a good time to take the high road... after all, you're FIRE and you've won the battle.
13. Now is the time to consider what your response would be to any unsolicited post-FIRE consulting or other employment offers.